After selecting "Register Now", fill out the Registration form that pops up, select the ticket type (Deposit or Pay in Full) and click Submit when done. This will take you to checkout where you can pay using PayPal or your credit card. If you don't have a PayPal account there is an option below the login box that allows you to select "Pay with a Debit or Credit card". If you elect to pay the balance remaining after the deposit in a lump sum on or before the due date, you just need to return to this page and select the Final Payment button, add to your cart and check out. You do not need to fill out the registration form again.