If you're talking about being a member of a group you hardly visit, just go to the group main page, scroll down...it will be above the group activity...you'll see blue buttons...and one of them says Group Settings/Leave Group. Click on that and you should see another blue button saying Leave Group. Click that and you should no longer be a member.
Now for groups that you own...either transfer ownership or you write to Cafemom admins about closing the group down.
at 11:31 PM on Dec. 3, 2009