@Mangamoz
No idea, shouldn't you be able to just click the 'Claim Group' button? If all else fails, you could @ one of the staff like Bartolumiu or Atifus on here.
I would ping Bart if you don't see something in a couple days - they have no shortage of reports and uploads to wade through, but he seems reasonably willing to bump folks through the queue if they're nice about it. Your presence on a couple of the forum leaderboards probably won't hurt either.
I don't believe you do, even @5hijima a group leader and she hasn't uploaded anything.