I can't figure out how to change the display image for a new post on the main blog site. When you first click my blog, (yourcaptainspeaking) the list of posts comes up and the first one has a weird geometric design that I cannot figure out how to change. I've managed my Gravatars and added media, but the geometric pictures won't disassociate with the post. How do I correct this?
The blog I need help with is yourcaptainspeaking.wordpress.com.