Go to your My Circles page by visiting http://www.globalsisterhood.org, logging in, and clicking on your profile photo in the upper right-hand corner (will appear as a tan, circular silhouette if you haven't yet added a profile photo.
From here, click on the name of the circle you wish to edit information for. Scroll down and on the lefthand side you should see a vertical navigation menu; click on "Manage." This is where you can edit your description and group name. Be sure to click "Save Changes" when you are finished updating your details.