Showcase Theme - Each post has a photo at the top of it, how do I set what photo that is?

Using Showcase theme. Each post has a photo at the top (This is not part of the flash swiveler bit (sorry, don't quite know how to describe it) :slight_smile:

The photo is blank, and I'm a bit confused where to set what photo I want there. Heck, it's probably not even part of the theme, and I'm being a total idiot.

I am a rank noob, and I apologize. I did look in the documentation, but I could not find the right answer, or frankly, and more likely, I am searching for the wrong words to find the right answer.

I have several questions, but will put each one in a separate post.

Joshua Marpet