Ok this is probably silly but how do I get something to show up in the thumbnail section of the page dashboard.
Nope, I assure that's not a silly question! What is silly is that we've had a placeholder image in the app for page thumbnails since day one, and have not gotten around to implementing them! For a variety of reasons (other features taking priority) we've left these on the back-burner, although a couple of us are dying to get them out the door soon. I can't give a real ETA, but just know that it's not your fault they aren't showing up :) Hopefully you'll see them working before too long.