Supporter plugin flowcycle

Hello,

I've installed the supporter plugin and I'm not sure how the flowcycle works. I see that the plugin includes an option at registration "if interested- yes or no". My question is: do I need to create an if else statement in the registration.php to redirect to a page where the paypal "subscribe" button sits?

If anyone knows how the supporter files are structured It would release this pain in my neck.

Thanks.