Make sure that you are logged in! You can verify that you are logged in by looking for your email address in the upper right corner of the screen. If you are not logged in, then you will see a login field there.
If you are logged in and being asked to pay, you may need to log out and back into the system.
If you have tried the above step and are still being asked to pay, we recommend logging out of the website, clearing your internet cookies, and then try logging back into the website.