If you are currently not in any Clique: Open the Clique window, and you will see the recommended Cliques you can join. You can also tap on the Search button and find the Clique you want to join by entering their Clique name or their Clique ID.
You can also receive invitations from your friends and join the Clique they are in.
You can also receive invitations from your friends and join the Clique they are in.