When you click "Submit Registration" you will be redirected to the PayPal login.
IF YOU HAVE a PayPal account, login and complete your payment.
IF YOU DO NOT HAVE a PayPal account, select the button on the bottom of the PayPal login labeled "Pay with Credit or Debit Card."
IF YOU WANT TO PAY BY CHECK, you need to go back to the APT website and select the link under "Check Payment."