Conquer Club

I want to leave the Music Discussion group, but when I try to resign from it, I get the message

You are not allowed to resign from your default group.

what am I supposed to do? I don't want to be in that group any more.

The only thing you can do is to PM the leader of another group and ask them to default you,
OR
Submit an e-ticket and ask for the admins to remove you.