How do i access my invoice to change the bank account details on it?

Welcome to the Community, @lahaulage2.

Let me share with you some insights on how you can edit an invoice in QuickBooks Online. 

Currently, changing a bank account in QuickBooks Online is not available. As a workaround, you can check for an available third-party app that can help you edit a bank account in an invoice. Here is where you can check for the supported third-party apps: QuickBooks apps.

Also, you may utilize our Help page to read articles and watch videos tutorials for more ways and tips to use QuickBooks. From there, you can click the tabs like for Topics about sales and customers and Training to watch video tutorials.

Please don't hesitate to visit the Community if you have additional questions about editing an invoice. I'll keep my notifications open. Take care!