Thank you for giving us the opportunity to help you with your business. It's my priority to ensure that you won't experience any interruptions with our services, so let me lend you a hand and help you update your card info.
The following steps below will guide you on how to find the Billing Info page, where you can update your information:
Click the Gear icon at the top.
Select Billing info.
Hit the pencil icon in the Payment information section
Update the credit card information, then select Update
To update the Billing address, fill out the current and correct address in the next section
Close the window when you're done making changes
You may also check out this article for more information about this process and for future reference:
Why is it so hard to update your card. I am having the same issue. Why make it difficult for your clients. Make it easier. This has made me want to seek another app that is user friendly. Ridiculous!! All i want to do is update my credit card and I cannot. This app sucks
I want to make sure you'll be able to update your card in QuickBooks Self-Employed, Stupidapp.
For the card that isn't updating, this can be caused by a cache-related issue. The too much-stored data file may lead to unusual behaviors in QuickBooks.
To clear this out, let's perform some basic troubleshooting steps. We can start by accessing QuickBooks Self-Employed account in a private window.
Google Chrome: Press CTRL + Shift + N.
Safari: Press Command + Shift + N.
Mozilla Firefox: Press CTRL + Shift + P.
Once signed in, go back to your billing section and update your card from there. If it rectifies the issue, go back to your main browser and clear its cache to remove the browser's history. You may also try accessing your account using another supported browser.