I have a friend that's trying to host a game via FileZilla Shell. He has it up and people can join, but nobody has admin on the server. How does he give admin or get admin?
That depends entirely on the game he's attempting to host, really. Some games have an 'admin.txt' file you can manually write admins into. Some games just grant admin to the hosting IP - in which case you've got a bit of a problem.