so I want to be clear on this.
I have a referral that is trying to sign up on a site
If he has already done --- media.hotgifts4you
he can also sign up for --- home.hotgifts4you as well can't he?
they are separate and require different logins right?
Correct - you can do each of the "sub-sites" of a network one time each.
Many (but not all) networks give you the option of "existing user" and will extend the info you already filled out to the new site.