I was wondering as well. I sent a message about it but no response so far! I have been a member of a handful of other forums. It would be convenient to have a "close account" or "leave group" button....you could just do it yourself and it would be no worries to the admin.
* laughs like crow, soars like eagle with vision of hawk, haunts like loon & lulls like nuthatch ....tickle tickle, feather has most powerful medicine of all...makes you laugh *