In the よくある質問 is written"Any established member of ファンポップ can create a new club around a topic of interest." That's why I asked. A new member when became "established" to be able to create a new group?
I think that an "Established Member" of ファンポップ means that あなた have set up an account. People who do not have an account can still access ファンポップ and most of its content.
If あなた notice, if あなた do not sign into fanpop, on the main page there is no button to create a new club.