How Do I Change the Thumbnail Image in WordPress?

Changing the thumbnail image in WordPress is a relatively easy process. To do so, open the WordPress admin area and navigate to the Media section. Here, you will find a list of all of the images included in your blog. To change the thumbnail image, select the image you wish to use and click the Edit link next to it.

You will then be prompted to enter a new thumbnail URL. To do this, simply enter the URL of the new image file and click Save.