Online TurboTax saves each time you change screens. You can come and go at will. To exit, click on MY ACCOUNT at the top and choose "Save and sign out."
When you return, go to your 2016 Tax Timeline and choose "Take me to my return."
You have clicked a link to a site outside of the TurboTax Community. By clicking "Continue", you will leave the Community and be taken to that site instead.