I need to update my credit card

Hi there, @sheila35.

If you want to change your payment method in QuickBooks Online, you can go to the Settings and update it from there. I'll show you the steps on how to do that.

Here's how:

1. Go to the Settings or Gear icon.
2. Select the Account and Settings.
3. On the left pane, click the Billing & Subscription menu.
4. Update the credit card information. (Card number, name on card, expiration date, and security code.) 
5. Make sure to verify the billing address in QuickBooks Online is the same billing address on the credit card statement.
6. Click Save Changes.

I've added this article for more information about updating the payment method of your subscription in QuickBooks Online: Update the payment information for your subscription.

If you meant something else, like updating your credit card in the Banking section, you can check this article for the detailed steps: Connect bank and credit card accounts to QuickBooks Online.

You might also want to check out this article to learn more how to match and categorize bank transactions: Match and categorize bank transactions in QuickBooks Online.

I'll be here if you need anything else. Let me know by clicking the Reply button. Stay safe always!