I also loved this sytem and even added the "refer a friend" hack to help people send out my site to their friends.

Just think if every member had 1 referral! It's viral marketing at it's best and you really need to get your members on board with sending out your link. Maybe ask them to put in their sig on their emails and what not. Just make sure the referral code is readily available for them to use.

Refer a friend is a good addition for sure. I mean, why would you not enable it?

Yup, I also edited it a bit to include bbcode and html code for those promoting on websites.

sorry dont know if i can ask here but how do i enable referral system so members can use it ?