Richard, at the payment page during checkout, simply choose credit card as payment type. Your debit card is run just like a credit card.
Stay safe & have a great day!

as long as the debit card has a Credit card logo it can be used like a credit card in checkout be aware it will result in paying the Credit card price and NOT the cash price

Hi Richard and welcome. When you check out, you use it exactly as a credit card (selectable during checkout). Debit Cards are processed the same as Credit Cards. Details under Payment Options here : budsgunshop.com/payment.php - Cheers and stay safe!