You would need to purchase, download and install on a personal computer one of the desktop editions for each tax year (2017 and 2016) from this website - https://turbotax.intuit.com/personal-taxes/past-years-products/
Prior year tax returns can only be printed and mailed, they cannot be e-filed. When mailing multiple tax years use a separate envelope for each tax year.
Or if you have a simple return you can get the blank forms from the IRS and fill them out by hand for free. I can give you links to them.
2017
How to finish a prior year online return
<a rel="nofollow" target="_blank" href="https://ttlc.intuit.com/questions/2559403-how-do-i-finish-a-prior-year-return-that-i-started-in-turbotax-online">https://ttlc.intuit.com/questions/2559403-how-do-i-finish-a-prior-year-return-that-i-started-in-turbotax-online</a>
If you have a simple return You can fill out the blank forms for free.
Here are some blank forms & instructions for 2017
1040 <a rel="nofollow" target="_blank" href="https://www.irs.gov/pub/irs-prior/f1040--2017.pdf">https://www.irs.gov/pub/irs-prior/f1040--2017.pdf</a>
Instructions <a rel="nofollow" target="_blank" href="https://www.irs.gov/pub/irs-prior/i1040gi--2017.pdf">https://www.irs.gov/pub/irs-prior/i1040gi--2017.pdf</a>
1040A <a rel="nofollow" target="_blank" href="https://www.irs.gov/pub/irs-prior/f1040a--2017.pdf">https://www.irs.gov/pub/irs-prior/f1040a--2017.pdf</a>
Instructions <a rel="nofollow" target="_blank" href="https://www.irs.gov/pub/irs-prior/i1040a--2017.pdf">https://www.irs.gov/pub/irs-prior/i1040a--2017.pdf</a>
1040EZ <a rel="nofollow" target="_blank" href="https://www.irs.gov/pub/irs-prior/f1040ez--2017.pdf">https://www.irs.gov/pub/irs-prior/f1040ez--2017.pdf</a>
Instructions <a rel="nofollow" target="_blank" href="https://www.irs.gov/pub/irs-prior/i1040ez--2017.pdf">https://www.irs.gov/pub/irs-prior/i1040ez--2017.pdf</a>
2017 Tax Tables <a rel="nofollow" target="_blank" href="https://www.irs.gov/pub/irs-prior/i1040tt--2017.pdf">https://www.irs.gov/pub/irs-prior/i1040tt--2017.pdf</a>
Publication 17 Tax Guide for 2017 <a rel="nofollow" target="_blank" href="https://www.irs.gov/pub/irs-prior/p17--2017.pdf">https://www.irs.gov/pub/irs-prior/p17--2017.pdf</a>
Don’t forget your state. And you will have to print and mail your returns. So be sure to attach copies of your W2s and any 1099s that have withholding on them. You have to mail federal and state in separate envelopes because they go to different places. Get a tracking number from the post office when you mail them for proof of filing.
2016
You can fill out the blank forms for free.
Here are some blank forms & instructions for 2016
1040 <a rel="nofollow" target="_blank" href="https://www.irs.gov/pub/irs-prior/f1040--2016.pdf">https://www.irs.gov/pub/irs-prior/f1040--2016.pdf</a>
Instructions <a rel="nofollow" target="_blank" href="https://www.irs.gov/pub/irs-prior/i1040gi--2016.pdf">https://www.irs.gov/pub/irs-prior/i1040gi--2016.pdf</a>
1040A <a rel="nofollow" target="_blank" href="https://www.irs.gov/pub/irs-prior/f1040a--2016.pdf">https://www.irs.gov/pub/irs-prior/f1040a--2016.pdf</a>
Instructions <a rel="nofollow" target="_blank" href="https://www.irs.gov/pub/irs-prior/i1040a--2016.pdf">https://www.irs.gov/pub/irs-prior/i1040a--2016.pdf</a>
1040EZ <a rel="nofollow" target="_blank" href="https://www.irs.gov/pub/irs-prior/f1040ez--2016.pdf">https://www.irs.gov/pub/irs-prior/f1040ez--2016.pdf</a>
Instructions <a rel="nofollow" target="_blank" href="https://www.irs.gov/pub/irs-prior/i1040ez--2016.pdf">https://www.irs.gov/pub/irs-prior/i1040ez--2016.pdf</a>
2016 Tax Tables <a rel="nofollow" target="_blank" href="https://www.irs.gov/pub/irs-prior/i1040tt--2016.pdf">https://www.irs.gov/pub/irs-prior/i1040tt--2016.pdf</a>
Publication 17 Tax Guide for 2016 <a rel="nofollow" target="_blank" href="https://www.irs.gov/pub/irs-prior/p17--2016.pdf">https://www.irs.gov/pub/irs-prior/p17--2016.pdf</a>