I haven't changed anything there.
I just tried fiddling with it but it either still send me back to the first sign up page or doesn't do anything sane at all.

What I want is:

User clicks sign up.
User is taken to my NEW_SIGN_UP_PAGE (it is in html.pl)
USer fills in data and clicks Next
User is taken to original SIGN_UP_PAGE
User clicks Submit
User may log-in.
What happens is that he never gets the second (original) signup page.