Okay so I have the sub account info for all of our sites, I have the button that links from our join.php page to the CCBill join page but..

Im having problems figuring out how to get the surfer to enter a user/pass and their name on OUR join.php and then pass that info to the CCBill join page so that it appears pre-filled.

Anyone know how to do this in real newbie terms please LOL ?

I know its gotta be something real simple but i cant see the forest for the trees :(