@Treymac, you can change your 'email' used to login to self serve. To do that you would have to be able to login to the self serve first. If you have forgotten that, you will need to message the moderator team as already suggested. There is another email in the system which is used by Public Mobile to contact you via email. That email is normally synced to the login email. For the communication email, the only way to change it is to ask the moderator team to do it.
