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Welcome to the Community, @executivedirecto.
You can go to the Banking page and update your bank account sign-in information from there. Let me guide you through the steps.
Here's an article you can read for more details: How to update your bank account sign-in information.
You might also want to check out this article to learn how to match and categorize bank transactions: Match and categorize bank transactions in QuickBooks Online.
Please let me know if you need clarification about this, or there's anything else I can do for you. I'll be standing by for your response. Have a great day.