If you wish to use a credit/debit card, rather than using your PayPal account, take the following steps:
1. Press "Continue Shopping" once you have all your items in cart (as shown below)
2. Then choose your desired shipping option and click Continue to payment
3. Click complete order and the page will redirect you to PayPal where you can choose your desired payment method.
4. "Checkout as Guest"
Now when this box shows up, press "Pay with Debit or Credit Card" and you will find the option to enter your long credit/debit card number, expiry etc. All without paying via your PayPal account.
5. Enter details
Now as you can see the option to enter your credit card option is available - enter your details and complete the checkout.