Hi! No worries of impatience, it is certainly possible for PMs to slip through the cracks so following up is no problem.
I did receive your PM yesterday, just didn't have a chance to take care of it until now.
Your name is now changed and should be all set. Don't be afraid to reach out if you ever need anything else!
PS:
Profile -> Modify Profile -> Personal Messaging
Check "Save a copy of each personal message in my sent items by default."
(it really should be a default setting, it's suuuuch a common question)