You can add a debit card to your payment methods of paying bills by creating an account in Chart of accounts (COA).
Let me show you how:
Click the Settings⚙ icon on the top right and then select Chart of accounts.
Select the New button beside Run Report.
Enter the Account Type, Detail Type, and Name.
Click Save and Close.
Once done, you can use the debit card as your payment account to pay your bills.
I have also included this link in case you have other questions about paying expenses: Pay Expenses And Bills.
In case you wanted to connect your debit card to QuickBooks banking, you can link it by clicking the small arrow ▼ in the Action column in Chart of Accounts, then select Connect bank. You can reference this link to learn more: Connect bank accounts from your Chart of accounts. This content covers how to categorize or match your recent transactions to QuickBooks.
If you have additional questions, feel free to comment below. I'll be happy to answer them. Stay safe and more power to you!