Link process

The issue I am having with this plugin starts when the user clicks the affiliate link where should it take the new user. Should it take them to the front page of the site or the sign up page of the site.

Reason I am asking is the link currently is taking the new user to the front page however when the new user clicks sign up to join the affiliate link disappears and if that new user signs up the credit is not received to the affiliate.

I know this is kinda of wordy but I want to explain it in the most detail so we can resolve.