[Plugin: Constant Contact for WordPress] Redirecting

Quick question I have the form saved although I think I understand why everyone else is having trouble it automatically is going to a new form when saved instead of staying on the existing form. My question is why and what code can I put in to redirect them to a different page after they click the submit button. What file is it in. The form for me is working btw and is intergrating with Constant Contact.

http://wordpress.org/extend/plugins/constant-contact-api/