You cannot include a 2017 W-2 on the 2018 tax return. It must be included on the 2017 tax return.
To complete and file a 2017 tax return using TurboTax you will need to purchase, download and install on a personal computer one of the 2017 desktop editions from this website - https://turbotax.intuit.com/personal-taxes/past-years-products/
A 2017 tax return can only be printed and mailed, it cannot be e-filed.
