change e-mail settings in php script

This project should be easy! I have a php script that sets up a 3 step web page. You can try it here: [login to view URL] The admin panel allows me to put in an account number to an autoresponder service that captures information when someone fills out the form. The problem is that I don't use that peculiar autoresponder service. What I need is for you to change it so that it will integrate with the one I have. I want it so that when someone fills out the form, it will subscribe the user with their first name and e-mail address to my autoresponder. You can change this setting in the [login to view URL] page which integrates with the [login to view URL] page. <?php echo $_common['formseries']; ?>"> Please see the two file attachments.