Modifying edit profile feature

Ok, I'm trying to integrate another membership system with Dolphin. Thus far, I know a user can edit their account. Currently, I want them to only change their email and password. How do I make the NickName disabled?

Most importantly, what files do I edit such that I can capture the variables for the email and password? I want it so that if a user edit their account in Dolhpin, then the same data (email and password) can automatically be updated in my other membership system.

member.php

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