You want to click on your Personal Info tab at the top left of your screen and select You & Your Family right below it. Now you will be on the Your Personal Info Summary page where you will scroll down to Your Filing Status.
I have included a LINK here that lists the criteria that the IRS uses to determine Head-Of-Household filing status
Assuming that you meet the criteria included in the LINK, please follow the steps below:
• Open your tax return and select the Personal Info tab at the top left of your screen
• When you see the page Your Personal Info Summary, click Edit next to your Filing Status
• Carefully go through the interview and review your answers paying special attention to the page Did you pay more than half the cost to keep up your home in 2016?
• Make sure to answer I paid more than half the costs to maintain my home.
• Now you should show Head-of-Household as your filing status.