How to add thumbnail/featured image in Wordpress Blog post

Hello guys ! Hope all of you are so fine today.Today we will learn,how to add a Thumbnail image in Wordpress Blog post.Its not so difficult.But must be so hard to a newbie learner.Ha ha ha ha ! Just joking man! Don't  think its true.
But before starting the main point of this tutorial.I will first show you a funny picture.See the below image.i'm damn sure that you'll must smile. :)

This is a real programmer shoe! :D

• By the way, Now we will learn.So,Its now time to stop your smile.First login to your Wordpress site.Go to write a new post. posts->Add new

•  A new window will open.Simply scroll down & on the right side you will see a option name: Featured image.Click here.

• Now another javascript window will open.Click on 'Select file'. You will now upload a image from your computer.

•  After uploading your selected image click on 'Set Featured image''.

•  Your work has almost done.See your picture is now on the featured.

• Now Publish your post . & Hurrah! its 100% completed!!!