I got you covered, zoesheetmetal.  

Before you delete a card account, you may want to take note of the following: 

• The account will remain inactive in QuickBooks Online.
• QBO will make an adjusting transaction if the account has a non-zero balance.
• You can activate the account again, however, you may need to correct the journal entries and balances.

Now, when you're ready, Let me show you how to delete an account in the Chart of Accounts: 

1. Click the Gear icon.
2. Under Your Company, click Chart of Accounts. 
3. Locate the account that you want to delete. 
4. Tap the View register drop-down arrow, and select Make inactive. 
5. Confirm that you want to delete the card account when prompted. 

However, If this account is connected to online banking, you can refer to this article for more details: Disconnect or delete accounts connected to online banking. 

That’s it. Let me know if you need anything else, I'm here to answer them and help you out. Have a good day!