CMS Made Simple Forums

i'm searchin' for a way to add more info to the notification mail that will be sent to the admin whenever someone registers with the module. I already found the text that goes into the notification mail on line 637 in SelfRegistration.module.php. I just haven't got clue how to reach the other info (filled out forms by the user) so that i can put it in.

I have some knowledge of php but not extensive. Any help would be very welcome