01-08-2013 02:43 PM
01-08-2013 02:51 PM
You can read below
KB28060 - How to change or update a BlackBerry ID username on the BlackBerry ID website
KB32514 - How to change or update a BlackBerry ID username on a BlackBerry smartphone
01-08-2013 03:37 PM
Try resetting the password using the below link & try signing in to you BB ID login.
I've given you other two artciles since you requested on how to change to a different email..