You do not have to have a PayPal account to make a payment. If you have a PayPal account, you will be asked on the next screen to login to your account to complete processing your payment.
If you don't have a PayPal account, you can still complete the process on PayPal's secure site.
The computer does not know who you are so it won't know how much you owe or what your payment should be without your manual input.
Input your amount...on this screen. You may have to input it again on the left side of the next screen. After that, just follow the directions on the right side of the screen.
Upon successful completion of your payment, PayPal will send you a receipt via email.
Thank you in advance for your business.