As noted in the Phonebook registration instructions, it is very difficult (if not impossible) to change a BlazerID/Phonebook alias once it has been set. The BlazerID is used for authentication by a number of services, as well as the forwarding mechanism for your @uab.edu e-mail. If your BlazerID changes, then all these services have to be changed as well; and all e-mail to your former @uab.edu address becomes undeliverable, creating headaches for your correspondents and the maintainers of any discussion lists to which you belong. If you simply desire a new @uab.edu address, you can accommoplish this by registering a mail-only alias, as described here.