Pligg Support

Can some one please help me that how can I add more fields in registration form,I want to add mobile number of users who want to register
How to create function for users:
enable or disable email notification when new inbox PM?
Many inbox emails is not good!
Beforehand thank you!
I received email when register on

How to add this template to my letters when registering on my pligg cms site?

PLIGG_PassEmail_verification_message - add to there?