I'm wondering how the whole signing up process works when you're not working alone, does only one person sign up and then submit the game while crediting the others or do we all sign up? Is there a specific way that a team should sign up? And if it's the former does only one of the people who signed up actually submit the game? I'm just a touch scared of pressing the "Join" button just for it to instantly sign me up and then later realise its not the correct way of doing this. Tnx in advance <3.

I believe that everyone needs to click "join" for the jam to be able to rate games at the end, but only one person will post the game, and they will be able to add their teammates accounts as admins/contributors to the game once submitted :). 

Message people who post here or get  friends to join in