If you see a message at the top of your page that reads "It looks like your account is already being sponsored. If you want to change your sponsor, please contact Support," this means that you tried to visit a URL that is used for enrolling into a program sponsorship.
You are seeing the message because your account is already sponsored, and it is not possible to change your sponsor by trying to enroll in another while your original sponsorship is still active.
To learn more about your current sponsor, please visit the Manage My Sponsorship page. On this page you can view your current sponsor and opt out of your sponsorship if you so choose.