Hi Edward,
Do you want to remove the account from Outlook for Mac?
Open Outlook for Mac. Go to Tools → Accounts. Select the incorrect Outlook account from the left pane. Click the minus (–) button at the bottom. Confirm Delete to remove it.
Then click the plus (+) button → New Account, enter the correct Outlook.com address, and sign in.
I hope you find this information useful. If you have any more questions, don't hesitate to reach out. Otherwise, please take a moment to accept the answer. Wishing you good luck!