I am trying to update my federal filing status from single to head of household but I'm not getting an option to change it. Can any one help advise?

[DoninGA]

You Must have a qualifying person as a dependent to be eligible for Head of Household

See this TurboTax support FAQ for Head of Household - https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-filing-status/qualify-head-household...

[DawnC]

If you qualify for Head of Household status, TurboTax will apply that filing status automatically.   To edit your answers in that section, return to the My Info or Personal Information section.      How to add a dependent - Review your answers in the filing status and dependent section.