The picture that will display your game. A thumbnail is what you see by the games on the home page, and all of the games you see. It's just that picture.
And first of all, make sure the game you are submitting is YOURS and not someone elses, or that would be stealing. The submit button is by the community button, just fill out all of the stuff and hit submit, then the game will go to the admins of armorgames, and they verify it, I think.
