How do I file 2017 tax returns and mail them to the IRS is I can't do it on TurboTax?

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You can purchase a download copy of TurboTax 2017 for use on a laptop or desktop computer. The online Turbotax application is for the current tax year only.

https://turbotax.intuit.com/personal-taxes/cd-download/

The prior year, 2015 thru 2017, desktop editions can be purchased and downloaded from this TurboTax website - https://turbotax.intuit.com/personal-taxes/past-years-products/