Originally Posted by poohbear_nc
User CP > Social Groups (under the Networking header) > click on the Group name to display the members > Leave Group on the lower blue bar.
I did it! But not that way - I wasn't actually a member any longer. But last time, it wouldn't show up in group subscriptions to un-subscribe and wouldn't let me re-join. This time I was able to re-join, then it showed in group subscriptions so I could unsubscribe, then leave the group again. Finally!!!