あなた can 削除 it completely if there's no one a ファン of it, because if あなた 削除 it and there's ファン on it the first person that joined will be 与えられた the ownership of the club and be their problem to deal with keeping the club up and running.
あなた 削除 it によって going to your クラブ and there will be a blueish grey "X" あなた push it あなた unfan the club but like I 発言しました if there's ファン already in it the first person that joined will get ownership and it won't 削除 the club unless there's no one (besides yourself) that is a ファン and あなた unfan the club, it will 削除 the club, there's no other way to 削除 the club permanently with other ファン in it.