clubs
Place your cursor over the "Share" icon (to the left of the screen, but may differ if your set-up is different). Select clubs from the options available. You should see suggested clubs and also a "Find clubs" at the top right of the screen. Search for a club and when you see one you wish to join, click on it. On the club's home page there is a button (orange, I think) that says Join. Click on it and your request is sent to the club. Someone will answer shortly and if accepted you'll receive a message and a club icon will show on your home page.
If you need help, please contact our Help and Support team.