User made groups + joining

[ Moved to the Fixing WordPress sub-forum. ]

Hello,

I need a simple plugin to create a form where people can create groups (2 texts needed, team name and team password – its for an e-sport event registration, which requires teams of 5 people) and an other page where the user can see which teams he/she is in, and a textbox where he/she can type the group password wich automatically ads him/her to the team member list.
+ I would need a table wich lists the teams who registered and its members.

I used Ultimate Members for the registration/login thing.
I’m not really into codes or anything very complicated.. :/

Thanks,
Martin