As for doing your 2017 return, you can do it with TurboTax, but you will have to use the desktop software that you will download to your computer - the Online system is only for the current tax year (2019).

For instructions on how to do this, please see this TurboTax FAQ on how to file a prior year return.

If you did not do your 2017 federal return in TurboTax, you will have to enter all your federal data and then do the state returns.

I haven't filed return for the years 2017 and 2016. for both federal and VA state taxes.  Can turboTAX software do both ?

Not with the Online software...that's only for 2019 right now.

You buy/download and install the separate 2017 & 2016 software onto your full MAC or Windows computer.......prepare each year separately, and mail the forms in to the IRS and VA.  Each year mailed in separate envelopes too.

https://turbotax.intuit.com/personal-taxes/past-years-products/2017