After you have made your selections and clicked the checkout button you'll be presented with a screen similar to the one shown below. There is no need for you to sign up for a PayPal account. If you do not have a paypal account, click the button labeled "click here" next to the words "If you do not have a PayPal account,"

You are then presented with the screen shown below. Fill out the information needed. Click the "Continue Checkout" button.

You will then be asked for your credit card and billing information. As well as some contact information should we need to contact you regarding your order.