This tutorial goes over how to add the WordPress featured image to your blog and single layout.
The first thing you want to do is determine what file your WordPress theme is using to display your blog posts. In this tutorial, the theme is using
Once you have the file that is displaying your blog posts, it is time to insert the code to display the featured image. If you follow the video tutorial I also go over how to add the featured image to your single post layout and even add a custom class to the featured image.
The markup below is the code used in this tutorial.