The TurboTax online editions are only for tax year 2017.  If you need to complete and file a 2016 tax return then clear the 2017 return.  Click on Tax Tools on the left side of the screen.  Click on Clear & Start Over.  Exit the program.

To complete a 2016 tax return using TurboTax you will need to purchase and download one of the 2016 desktop editions from this website - https://turbotax.intuit.com/personal-taxes/past-years-products/

A 2016 tax return can only be printed and mailed, it cannot be e-filed.