It's nice to have you here in the Community, Lauragee.
Let me provide some insight on how to change your bank information in QuickBooks Online (QBO).
To begin with, may I ask what specific bank information you would like to change? If it's in the bank information on the banking page, you can edit information by selecting the bank that you want to edit. To do so, follow the steps below:
Go to the left navigation panel and select Transactions.
In the Bank Transactions section, select the Edit or Pencil icon of your bank and click Edit Account Info.
Make changes to the account you want to change.
Verify that you have entered all the necessary information and clicked Saveand Close.
However, if you're referring to the banking information in the billing and subscription, you can change the payment method or information. Here's how:
Go to Settings and select Subscriptions and Billing.
Select the Billing details tab.
Select Edit billing information and update your payment info.
This will launch the Wallet list, from this view you can:
Edit the payment method used for QuickBooks Online billing (expiration date, billing address, account holder name)
Add a new payment to be used for QuickBooks Online billing
Switch QuickBooks Online billing to the previously stored payment method
After saving your change, the payment method will appear on the billing details tab.