Hi there, kerrybridgechurc.
Thank you for taking the time to reach out here in the Community. I'd be glad to provide some additional insight on editing the sign-in info for your bank account.
As an initial trouble-shooting step, you may want to try clearing the cache in your internet browser. Sometimes the cache can become bogged down with older data, potentially causing performance and viewing errors in QuickBooks Online. This article provides steps on this process, depending upon which browser you're using: https://quickbooks.intuit.com/community/Getting-Started/How-do-I-clear-my-browser-cache-and-temporar....
Let me know how things look after giving this a try. I'll keep an eye out for your reply.