What you can do is go to your dashboard, select the post you want to add a thumbnail to and scroll down to featured image and click on set featured image.
If you don't have featured image add this code to your functions.php (Back-up functions.php before you add the code):
Code:
add_theme_support( 'post-thumbnails' );
Then upload the thumbnail you want and set as featured image.
Go to appearance then editor and open loop.php, copy paste the content in notepad++ and find this line:
This WordPress plugin installs a new sidebar widget that can display the latest posts with automatic thumbnail images. It also creates new PHP functions that can be included in any template to display a posts list with thumbnails and excerpts
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