You must first enroll at ShopWithScrip.com. Find the Create Account button on the frontpage to begin. During the enrollment process you will need to add your personal information as well as a student name and enrollment code. The student name tells us which family is to receive the SCRIP credits (use any child's name in the family). HCAs enrollment code is 46FF142B1991, this will allow you to associate your account with HCA.
Once you've enrolled, shop away. You can browse through a list of shops, or search for your favorites. The site includes a help feature for more information.