1. Go to your profile. i.e. at the top of the page click profile next to 'Hello [insert name here]'.
2. Click 'Clubs'. on the bar with links underneath your motto(the gray words under your big blue name)
3. Find the club that you want to unsubscribe from (sort by and filter if necessary).
4. Click the red unsubscribe link that is underneath the name of the club.