I looked at the Name Change page, I am afraid you can not use my old user name. I understand how this suxs! So sorry:
More details about username changes:
- Username changes are available to anyone with an active Premium Membership -- whether you bought it yourself or it was gifted to you.
- You cannot change your username to one that is taken even if you are the owner of both. You cannot claim a deactivated account.
- No one will be able to claim your old username.
- You can simply change the capitalization of your username.
- Group username changes are not supported at this time.
- Premium Membership purchases cannot be refunded once you have changed your username.