If you prefer to use your credit card or debit card for payment, and not sign up for a PayPal account -
After registering and entering your personal info, or after logging in (if you already have an account), scroll down to the bottom of the page and you will see:
Prefer to pay with Credit Card or Debit Card (instead of PayPal), on the payment page scroll down to "Pay with Debit or Credit Card".
Click the "Next" button. On the next page (payment page), scroll down and click "Pay with Debit or Credit Card". Now you can pay with your credit/debit card and you won't have to sign up for a PayPal account.