If you have not yet filed your return, yes, you can change your filing status by returning to the My Info section of the program. On the Personal Info Summary page, click on the pencil next to your status. Please be aware that you can select your status and TurboTax will recommend the best filing status for your later in the interview. To determine if you qualify for Head of Household, see below.
https://ttlc.intuit.com/replies/3288637
If you have already filed, you can file an amended return to change your filing status. Amendments will be available in TurboTax mid-February. Additional information is provided below for filing an amended return.
https://ttlc.intuit.com/replies/3288565
