It’s easy. Just sign up on the Affiliate page to associate your EllisLab’s account with your PayPal account (this is how we pay you).

Next, place an affiliate link on your website to the EllisLab Network (you can find the link in the Affiliate account details).  Everything else is automatic. We will track people who come to our site based on your affiliate link and if they make a purchase we attribute it to you.