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Unable to locate elements on a website , i tried all the locators but I get the error "No such element" . I am a self taught beginner to Automation

Element HTML:
Inbox
What I tried:
driver.findElement(By.cssSelector("a[text='Log out']"));
then
driver.findElement(By.xpath("//a[.='Log out']"));
Element snapshot:
HTML

driver.findElement(By.linkText("Log out"));
Something like that should work, you should provide the page html for a better response.
My response is based on the fact that in your first try you are saying text='Log out'.
findElement in selenium works with locatorStrategies (By.cssSelector/By.linkText...) the one that i used (linkText) search in all the anchor tags that are found in the pages () and analyze the text inside the tag, if the text is matched the driver will find the element.
Let me know if it works, otherwise provide me the web page html snippet.
I've seen the actual screen, you must change Log out with Inbox
driver.findElement(By.linkText("Inbox"));

Given the HTML:
Inbox
You need to take care of a couple of things here as follows:
Within cssSelector doesn't supports the :contains("text") method
Within xpath for exact text matches you need to use text()
Solution
To identify the element you can use either of the following locator strategies:
Using linkText:
WebElement element = driver.findElement(By.linkText("Log out"));
Using cssSelector:
WebElement element = driver.findElement(By.cssSelector("a[href$='INBOX'][title='View the Inbox']"));
Using xpath:
WebElement element = driver.findElement(By.xpath("//a[text()='Inbox' and #title='View the Inbox']"));

xPath Text Contains Selenium Web Driver

I'm trying to select an element based on its text contents. I am using XPath to achieve this.
I am just puzzled as this should work?
WebElement link = obj.driver.findElement(By.xpath("//div[contains(text(), 'Notifications')]"));
I'll even copy the HTML code:
<div class="linkWrap noCount">Notifications <span class="count _5wk0 hidden_elem uiSideNavCountText">(<span class="countValue fsm">0</span><span class="maxCountIndicator"></span>)</span></div>
The div element has the words "Notifications" inside it. So why doesn't it work.
Go to this page on Facebook: https://www.facebook.com/settings
Use this chrome extension to highlight any area via xPath.

You have a space before the word Notifications:
WebElement link = obj.driver.findElement(By.xpath("//div[contains(text(), 'Notifications')]"));
You should also add a wait for element before trying to find the element:
WebDriverWait wait = new WebDriverWait(webDriver, timeoutInSeconds);
wait.until(ExpectedConditions.visibilityOfElementLocated(By.xpath("//div[contains(text(), 'Notifications')]"));
WebElement link = obj.driver.findElement(By.xpath("//div[contains(text(), 'Notifications')]"));

I found the issue with the help of some amazing people in this community.
Ok, so my element was in an iFrame.
In order to access the element, I must first access the iFrame
WebElement iframe = obj.driver.findElement(By.xpath("//iframe[#tabindex='-1']"));
obj.driver.switchTo().frame(iframe);

How can i click on this button with selenium

How can i click on this button with selenium ?
<a class="_42ft _4jy0 rfloat _ohf _4jy4 _517h _51sy" role="button" href="" ajaxify="/nux/wizard/step/?action=skip" rel="async-post" id="u_9_8">İleri</a>

Something I wish I would have figured out earlier was how to create my own advanced CSS selectors here is the page that taught me, it will work in all cases assuming your element is visible in the DOM.
https://www.smashingmagazine.com/2009/08/taming-advanced-css-selectors/
For your given element you could write this many ways
Generic form
tag[attribute='ATTRIBUTE_VALUE']
For your example
a[id='u_9_8']
or
a[class='_42ft _4jy0 rfloat _ohf _4jy4 _517h _51sy']
or
a[rel='async-post']
Now all these selectors will only be useful if the attribute is unique. But take a look at that article there are many tricks you can use to make CSS selectors work for you.

By using xpath with contains text you can click on the element(below is the answer)
driver.findElement(By.xpath("//a[contains(text(),'Ileri')]")).click();
Try it and let me know if it works for you

Try any of these below mentioned code.
Using id locator
driver.findElement(By.id("u_9_8")).click();
Using xpath locator
driver.findElement(By.xpath("//a[text()= 'İleri']").click();
Explanation:- Use text method along with <a>tag.
driver.findElement(By.xpath("//a[#role='button'][text()= 'İleri']").click();
Explanation:- Use role attribute and text method along with <a> tag.

Please add the wait conditions before you are going to click
Element clicking Via linkText :
webDriver.findElement(By.linkText("İleri")).click();
Element clicking Via id :
webDriver.findElement(By.id("u_9_8")).click();
Element clicking Via cssSelector :
1.webDriver.findElement(By.cssSelector("._42ft._4jy0.rfloat._ohf._4jy4._517h._51sy")).click();
2.webDriver.findElement(By.cssSelector("a[class='_42ft _4jy0 rfloat _ohf _4jy4 _517h _51sy']")).click();
Element clicking Via javaScript :
((JavascriptExecutor) driver).executeScript("arguments[0].click();", webElement);
Here you need to pass the element locator instead of webElement.

We can see ID attribute tag so we can use ID "u_9_8" to click on the button.
use the below code.
driver.findelement(By.id("u_9_8")).click();

I think you should be able to use the id
driver.findElement(By.id("u_9_8")).click();
Give it a shot

Selenium doesn't recognise xpath

I am using Selenium WebDriver to get from a drop down list values. Unfortunately I can't get it, because my code can't recognise the xpath.
Here's my code:
WebElement selector = driver.findElement(By.xpath("id('search')/x:fieldset/x:table[1]/x:tbody/x:tr[2]/x:td[1]/x:select"));
Select s = new Select(selector);
List<WebElement> options = s.getOptions();
for (WebElement wb : options) {
System.out.println(wb.getText());
}
The problem is with the 1st line (WebElement selector). In output I get something like this:
Exception in thread "main"
org.openqa.selenium.InvalidSelectorException: The xpath expression
'id('search')/x:fieldset/x:table[1]/x:tbody/x:tr[2]/x:td[1]/x:select'
cannot be evaluated
I've even tried to find by name or class, but selenium still doesn't find this list.
How to solve the problem? Thanks in advance :)

Ganjira, This is no way to write a xpath. If you find it tough to recognize item . Use Selenium IDE 'Select' button.

If you can provide sample of html page on which you try to find your element, it would be very helpful. Anyway, try to search using css selectors e.g.
WebElement selector = driver.findElement(By.css("#search > select"));

How to fill The form in a popup

I'am trying to automate http://rose.99ats.com/careers.aspx
After clicking on "signup", I couldn't find the element Popup. I used getWindowHandle(), also used driver.swithchto(), but getting error. I can't find element.

Because it's in a new iframe, you need to use driver.switchTo().frame().
Here is a detailed answer on using switchTo(), in which you can't use name/id in your case, index should generally be avoided, so you may try locate the iframe element by css selector or xpath first, then switch to this WebElement.
WebElement popup = driver.findElement(By.cssSelector("iframe[src^='CareerSignUp.aspx']"));
driver.switchTo().frame(popup);
// or by index: driver.switchTo().frame(0);