HappyGuppyPuppy knows more about this stuff than I do but at another group they were posting this link to change your name.
I clicked on it and it did give the option of changing it. But remember, it WILL change it to the same one in all of your groups.
I am Bubbles here and Debbie The Seed Queen in Our Garden Gang and I want to keep those two seperate so I won't be utilizing the little cool smilie.
Hope it works for you guys.
Bubbles
(the one and only)