Clubs are made and run by members from /clubs. Joining, inviting, promoting somebody to leader and adding a forum all happen on the club's own page.
Admin → Clubs exists for your questions instead: what clubs there are, who owns them, how many people are in them, and removing one.
🚨 A club holding anything refuses to be deleted. Deleting a club deletes its group, and anything still restricted to that group would become restricted to a group that does not exist — invisible, with nothing to explain it. Empty it first, deliberately.
One thing clubs deliberately cannot do: be readable by everybody while only members post. Convoro has no per-forum write permission, so that would be a rule advertised and not enforced.