Hey! I'd be happy to help you understand how it works, because I know how confusing it can feel. This is my second jam, and I figured it out by reading the whole overview page in my last jam. This time the overview page seems to have less info, maybe they’ll add more details later.
Since the jam is still 3 months away, a bit before it starts (not sure exactly when), there’ll be a voting period. The jam host will give us theme options to vote on, and the one with the most votes will be chosen as the theme. It’ll be announced on the main page, Discord, and in a YouTube community post.
If you need any help, just let me know I’d be happy to help!