I figured this out just for fun. I hope you like it :)
First, you go to your friends page (like your page where it lists all of your friends that you have on Stardoll) and you click on the write comment button. (You can do this on any person)then cick save, but while it is still saving click the "group" button quickly and then it will change the word "group" into whatever you put in your comment! But when you actually group thm into another place on your list (like friends, best friends, unclassified etc.) it will change you comment back into the comment box and the group button will still say "group" on it.