You do not need a PayPal account to pay to use PayPal and make payment with a credit card. You may enter your credit card directly into PayPal to make payment. You can do so without creating a Paypal account. Here's what to do after you're redirected from a website to PayPal:
1. Select the "Don't have a PayPal account?" option.
2. Enter your credit card information and click on "Review and Continue".
3. Click on "Pay Now"
4. Click on "No, Thanks"
That's it, you're done.