436752 Vbulletin integration with php membership site fixes

My vbulletin forum is integrated with my php based membership site such that registrations can be done only from the membership site. The code has already been created and is working fine at times but sometimes it doesnt work -- must be a small glitch in the way it is programmed causing this. I want to also add this new feature - such that users are able to change their passwords and email addresses only from within the membership site and not from the forum any longer. These 2 should be easy tasks for a programmer with prior experiences of vbulletin integration with any kind of script.