When you have refereed someone to this site and they go to register do they need to put your user name in that slot for Refereed by?

yeah, By typing in the username of the person who reffered you, it counts towards your refferal Count, But as far im aware, The person needs to be active to a certain degree to count towards your refferal count :/

Oh, no wonder xP

I've referred like 5 people this past two months, but I guess none of them are active enough. :)