On the other hand, you can refer to this article and follow the steps to change your login credentials if you've already signed in to your QuickBooks account: Change sign-in information in QuickBooks.
Moreover, I'll share this information in case you want to make changes to your payment method or account information in QBO: Manage your Intuit Account online.
Cheers to an updated and efficient QuickBooks experience, Ram. Please know that you can always revisit this thread if you've further questions about updating your credentials in QBO. We're here every step of the way.
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