If you click "Finish Registration" and the form is incomplete you will receive an error message above the "Order Summary".
You can click each link and your page will automatically scroll to center that field on your screen. Non required fields will not have a link associated to them.
Each required field that is incomplete will also highlight red.
Non required fields that are incomplete will not highlight red.
Once the registration is complete your error message will adjust appropriately.
Now when you click "Finish Registration" you will be taken to your Registration Confirmation page and a confirmation email will be sent to the email provided on the registration form.