How do i integrate the affiliate plugin to my system properly?

Ive added the plugin, and can se if a member sent a user(click) to my homepage. But not if that user has become a member.

Im having a site, where i want to pay my affiliates if the click turns in to a signup.

Ive tryed to read through this page: but really dont understand how i can manage to do, what i wrote above.

I really hope that you can help me,

Best regards,

Casper Minding