441367 PHP register work needed

ok I have a newsletter form from aweber that my members signup to join my newsletter.. ok when they do it passes their details to my membership form on the next page so it is already filled in for them, all they have to do is click the "submit button" and they are then registered for my membership site. What I want is to cut the last step out and when they subscribe to my newsletter it will register them to the membership site without them having to do it. This is a personal project and can't pay to much but can give a good review.. regards, Successman