Getting out of non-sl groups?

So I joined a store's group, but it wasn't one of the standard 25 that you can join.. It's a subscribe-o-matic... and all I get from it is spam, and I can't figure out how to get back out! Went back to the store, didn't see any unsubscribe option.. and of course it doesn't show up in my groups.. How do I un-subscribe-o-matic?!

Oh, I forgot to include at first that it's group-owned, and the profile for the group that owns it isn't visible.

Normally you just go back to the store and hit the subscribe sign.. With some programs this will unsubscribe you, with other it will give you a blue menu with the option to unsubscribe. If this doesn't work contact the store owner and ask. I am sure the store owner would be more than willing to help you out.

Here is the Subscrib-o-matic website:

http://www.subscribeomatic.com/groups/index

I *thought* there was a way to manage your groups from the site, but didn't see a way to do it this time, so may have been mistaken.

It does give a list of all the groups, along with inworld kiosk locations - maybe that would help you find where to go drop the group?