Online is only good for the current year 2017 so you have to buy the Desktop CD/Download program here https://turbotax.intuit.com/personal-taxes/past-years-products/
Or you can get the blank forms from the IRS and do them by hand. Either way you will have to print and mail prior year returns. And send each year in a separate envelope so the IRS doesn't miss any.
You need to have a full Windows or Mac computer to install the 2016 and 2014 programs. Or 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>
And Here are some blank forms & instructions for 2014
1040 <a rel="nofollow" target="_blank" href="https://www.irs.gov/pub/irs-prior/f1040--2014.pdf">https://www.irs.gov/pub/irs-prior/f1040--2014.pdf</a>
Instructions <a rel="nofollow" target="_blank" href="https://www.irs.gov/pub/irs-prior/i1040gi--2014.pdf">https://www.irs.gov/pub/irs-prior/i1040gi--2014.pdf</a>
1040A <a rel="nofollow" target="_blank" href="https://www.irs.gov/pub/irs-prior/f1040a--2014.pdf">https://www.irs.gov/pub/irs-prior/f1040a--2014.pdf</a>
Instructions <a rel="nofollow" target="_blank" href="https://www.irs.gov/pub/irs-prior/i1040a--2014.pdf">https://www.irs.gov/pub/irs-prior/i1040a--2014.pdf</a>
1040EZ <a rel="nofollow" target="_blank" href="https://www.irs.gov/pub/irs-prior/f1040ez--2014.pdf">https://www.irs.gov/pub/irs-prior/f1040ez--2014.pdf</a>
Instructions <a rel="nofollow" target="_blank" href="https://www.irs.gov/pub/irs-prior/i1040ez--2014.pdf">https://www.irs.gov/pub/irs-prior/i1040ez--2014.pdf</a>
2014 Tax Tables <a rel="nofollow" target="_blank" href="https://www.irs.gov/pub/irs-prior/i1040tt--2014.pdf">https://www.irs.gov/pub/irs-prior/i1040tt--2014.pdf</a>
Publication 17 Tax Guide for 2014 <a rel="nofollow" target="_blank" href="https://www.irs.gov/pub/irs-prior/p17--2014.pdf">https://www.irs.gov/pub/irs-prior/p17--2014.pdf</a>