KO means "Keeper Of" and you can check out the thread to "Keep" stuff
here.As for the username, if you need to change your username, you can PM GlitterModerators and request a name change, but you must keep in mind the name change guidelines at the top of the Announcements thread. And also keep in mind that, for the sake of everyone's memories, we will not do frequent name changes for the same member. So make sure you pick something that you're going to want to keep for a while. :)