How do I change from "submit taxes together" to "submit taxes separately". I can't seem to find that page again.

To file your tax return separately, unfortunately, you would have to start your return again.

On your new tax return when you indicate that you are married, simply select No to the question, "Do you want to prepare your returns together?" in the profile section of your income tax return when using TurboTax Free.

Thank you for using TurboTax.