Payment process without Paypal Account with Credit Card:
Click on Checkout (or verify) and if correct (when Shipping adress ok) Click on Complete Order.
A new screen Paypal opened :
If you have a Paypal Account you can Pay with your Account or directly "Pay by Credit Card" (see down).
Without Account Paypal you can open an Account or to Pay directly by Credit Card "Pay by Credit Card" (see down). In this case you click on "Pay by Debit or Credit Card")
It is important to understand that a Paypal Account is not necessary.
Paypal is used as a secure means of Payment.