You can't do a prior year return online or efile it, but you can buy the Desktop Download versions for 2014-2016 from Turbo Tax here. Be sure to pick the right one, Windows or Mac....
http://turbotax.intuit.com/personal-taxes/past-years-products.jsp You will have to print and mail in prior year returns.
Or if you have a simple return you can get the blank forms from the IRS and fill them in by hand for free.
Here are some blank forms & instructions for 2016
1040
https://www.irs.gov/pub/irs-prior/f1040--2016.pdf Instructions
https://www.irs.gov/pub/irs-prior/i1040gi--2016.pdf 1040A
https://www.irs.gov/pub/irs-prior/f1040a--2016.pdf Instructions
https://www.irs.gov/pub/irs-prior/i1040a--2016.pdf 1040EZ
https://www.irs.gov/pub/irs-prior/f1040ez--2016.pdf Instructions
https://www.irs.gov/pub/irs-prior/i1040ez--2016.pdf 2016 Tax Tables
https://www.irs.gov/pub/irs-prior/i1040tt--2016.pdf Publication 17 Tax Guide for 2016
https://www.irs.gov/pub/irs-prior/p17--2016.pdf
