Hello there, @Anonymous.

I'd be glad to help you change your email address in your QuickBooks Desktop (QBDT).

To update your email address for notifications, here's how:

1. Sign in to your Intuit account.
2. In the Manage your QuickBooks page, select the Intuit Account.
3. Select Sign in & security, and enter your new email address in the Email address and Confirm email address field.
4. Enter your user ID password in the Password field.
5. Select Save. This sends a verification email to your new email address.
6. Go to your email inbox and open the verification email. Select Verify my email.
7. Once you see the prompt Email address verified, select Continue to complete the email change.

For more detailed information about changing the email address you use for QuickBooks Desktop, you can check this article: Update the email address.

For reference, if you're not able to sign in, and you no longer have access to the email address for your account, you can check this article: Recover your Intuit Account.

Please don't hesitate to leave a comment below if you have further questions about changing your email address or other QBDT-related questions. I'll be happy to assist you.