Let's make sure you're able to access your account without interruptions. Have you tried adding the ABN and payment details in a private window? This prevents cookies from being stored on the computer, making it a great place to identify browser problems.
Use any of these keyboard shortcuts depending on the browser you're using:
Google Chrome: press Ctrl + Shift + N
Mozilla Firefox: press Ctrl + Shift + P
Internet Explorer: press Ctrl + Shift + P
Safari: press Command + Shift + N
Perform the steps in the private window:
Click the Gear icon and select Account and Settings.
Tap the Company section and choose Company name.
Enter the ABN then press Save and Done.
To edit your payment details for your subscription, use these steps:
Go to Settings ⚙ icon and select Account and Settings. You must be the Master or Company Admin of the account.
Press Billing Subscription, then hit Edit ✎ beside your payment method.
Update your credit card info.
Make sure the address in QuickBooks matches the credit card statement.
If you're still unable to update your company details, I highly recommend contacting us directly. Our representatives can create an investigation for this unexpected behavior. Our Support Team are available from 6:00 AM until 6:00 PM on weekdays, and 6:00 AM til 3:00 PM on Saturday.
You can also request a callback, so you won't have to wait on the line. Here's how:
Sign in to your QBO account.
Click the (?) Help icon in the upper right-hand corner of the Dashboard.
From there, select the Contact Us button and enter your concern in the description box.
Once done, select Chat, Call us or Get a callback option.
Let me know how things go in the comment. I want to ensure this is resolved and I am here if you need further assistance. Have a nice day!