I’ve been trying to add my credit card onto my transactions and it isn’t letting me, (I already have my debit card on there) does anyone know why?

Hi, micabamford.

Performance issues in QuickBooks Mobile App are resolved by doing basic troubleshooting steps. Let's start by resetting the app data to clear the cache and refresh it into its default state.

Here's how:

1. Click Help on the navigation bar at the top.
2. Select Reset App Data.
3. Allow a moment for the process to complete, and then close the app.
4. Be sure to right-click the app and Run as Administrator when re-opening.

If the persists, let's try to uninstall then reinstall the app. You can get the detailed steps in this article: QuickBooks App for Windows and Mac: General support.

You might want to check these articles to know other features in QuickBooks Online app:

Compare mobile app features

Mobile in-product help topics and FAQs

Additionally, in case you want to know some "How do I" steps in QuickBooks Online, you can always visit our Help Articles page for reference.

You know where to find me if you need further assistance with QuickBooks. Have a great day.