When people register for programs on an admin's StadiumRoar site, their registration information is visible to the admin but not the public. The admin can see names, contact info, and fees paid in their registration section, while the public only sees a register button. People register by visiting the site's public link and filling out an online form with required fields. They can optionally pay registration fees through PayPal. The admin then views a list of participants signed up for each program.