I cant change my credit card details for payment i have followed all the advice and still not working. what do I do ?

I appreciate you for trying some steps to resolve this issue, jonathan50.

Let's open QuickBooks on a private window. It is the best place to identify for any browser related issues. I've added these keyboard keys to open one:

• Google Chrome: Ctrl + Shift + N
• Mozilla Firefox: Ctrl + Shift + P
• Microsoft Edge: Ctrl + Shift + P
• Safari: Command + Shift + N

If it works, we can go back to a regular browser and clear its cache. A piled cache can also be the reason for some unexpected issues on the opened pages.

We can also switch to a different supported-browser like Google Chrome, Mozilla Firefox, Safari, or Microsoft Edge.

If the issue persists, I'd recommend reaching out to our Phone Support team so an agent can take a look at your account and verify why you're unable to change your credit card details.

I've also added this reference for more information about changing credit card details: Manage billing, payment, and subscription info in QuickBooks Online.

I'll be around if there's anything that I can help. Keep safe!