If you want to pay with your credit card without signing up with PayPal, you should first click "Complete order" on the checkout page.
Now, you would be redirected to the PayPal login page. If you want to pay with your credit card without signing up on the page, you should do that by clicking on the “Pay with Debit or Credit Card” button.
Now, you are presented with a form that requires the information about your credit or debit card. Depending on your country, you may also be asked to enter your address, email address, or phone number. To continue after entering all the information necessary, simply click on “Pay now” at the bottom of the form
Afterwards, you will be asked whether you want to create a PayPal account. If you decide to do so, you can register with the information entered. If you still have no desire to use PayPal more regularly by entering your information, you can – of course – decline.
With getting the confirmation of PayPal that your purchase has been made, the services you ordered will be available for you immediately.