When you want to use your credit card for payment choose Paypal button.  Once you finish choosing your products and entering your name and address to the shopping cart you will click on the finalize payment button.  This will take you to the Paypal site.  You can pay with your Paypal account OR use your credit card if you don't have a Paypal account.  Below is the page you will see.  Click on the link that we have put an arrow on in the sample page below and this will open up the Credit Card info section.  Enter your card info and you are done.