I don't understand that rule. What does it mean I got to send "co author" before ulpading?
That is if I am working with a team, Right?
(Sorry if it is a silly question)
This rule does this. When you finish your game. Click "edit game", then click "more" and select "admins" from the drop-down list. Enter https://horror-hatch.itch.io/ in the box for the URL. You'll end up with a link to your game, which you'll need to fill out when you submit your game.