Deleting Old usernames??

hello, i just created a new account, i use to be Halfman_halftiger53, i have one question in regards to the e-mail system, how do i delete my old profile so i can have e-mails sent to my new account, Blitz21, when i made this account i had to put it my girlfriends e-mail to recive any letters, just wondering if there was a way to delete my old name and set things up on my new one!