How can I see what users a user referred?
Do you mean which users have entered someone into the referral box on sign-up? Or see which users have referred people to your forum?
Lets say you join my site and get 3 referral's. I want to be able to see the usernames of the 3 people you referred.
I don't think it's possible, which is why I disabled the in-built system and use Labrocca's plugin.