If you never filed a 2016 tax return then you would need to purchase, download and install on a personal computer one of the 2016 desktop editions from this TurboTax 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.
If you did file a 2016 tax return then you would need to file an amended tax return for 2016 to add the 2016 W-2's.
See this TurboTax support FAQ for amending a 2016 tax return originally completed and filed using TurboTax - https://ttlc.intuit.com/community/amending/help/how-do-i-amend-a-return-in-turbotax/01/26768
FYI ... it is now too late to get a 2016 refund but you must file if you have a requirement to do so and/or you owe. And the 2016 program will only be supported for another 3 months so if you need it get it soon. https://turbotax.intuit.com/personal-taxes/past-years-products/