How to Add Thumbnails to Posts in WordPress

Step 1. Open post editor and find “Upload/Insert” and click the photo image.

Step 2. Select “Media Library”.

Step 3. Type in the player’s last name and make sure the word “THUMB” is in the title of the image results.

Step 4. Press “Show” on the image of your choice.

Step 5. Scroll down a bit and select “Use as featured image”. Then press “Save all changes”.