Join a club by going to that Club's wall and tapping Join at the bottom of the screen!
Clubs are constantly recruiting in-game, try searching for one that you like in Campus chat, Pub chat, or on the Forums!
You can search for clubs by going to the bottom of your home screen and tapping on 'Club'.
From there, you will enter the Club screen!
It will either show your current Club, or different options for finding a new Club!
Start a Club will allow you to make your own club for the cost of $200M Cash or 100 EC's.
Campus Buzz will show you all the current clubs with Active Parties.
Find Clubs will allow you to browse clubs, or search for a specific Club by name.