Two settings control who can join a club:
Is available: new members can join the club.
Show on website: the club's signup shows on your website.
Both are ticked when you create a club. The back office is the WithWine admin area you log in to at withwine.com.
Examples
Invite-only club: tick Is available and untick Show on website. Customers can't join the club themselves. Your staff sign members up in the back office.
Old club with existing members: untick both. No one new can join, and you keep managing your existing members.
Steps
Go to Settings > Clubs.
Select the club's name to open it.
Under Club details, tick or untick Is available and Show on website.
Select Save.
