Do not use site messages, notes, or forums to invite people to your club. If you do, your account could be flagged as a spam account.
Click on Invite Member under the Admin Settings menu to your right.
List all the members you wish to invite and write a message to send to them. You can send up to 30 invites every 24 hours. Each member invited can join the club at any time, even if they lose the invitation message:
You can also post an invitation link elsewhere for anyone to join by clicking on it. Click on the Update Link button to generate a new link, which will deactivate any previous invite link:
Additionally, you can send invites using the Invite button on the header of your club:
