I want to do a return for 2014

Turbotax Online works only for current year (2016) taxes, and not for any other year.
If you want to use TurboTax for any other year you will need to purchase the Desktop Version and install it on your own computer for each year that you need to file. You can do that at this link:
http://shop.turbotax.intuit.com/personal-taxes/past-years-products.jsp

You can download the Forms and Instructions free from the IRS web site at this link:
http://www.irs.gov/app/picklist/list/priorFormPublication.html

In any event, you have to file the return by mail. Turbotax does not support e-file of prior year returns. Tip: If you prepare multiple years of prior returns, mail each one to the IRS in a separate envelope to be sure that each one is recognized as a separate tax return.

2014
Here are some blank forms & instructions for 2014
1040 https://www.irs.gov/pub/irs-prior/f1040--2014.pdf     Instructions https://www.irs.gov/pub/irs-prior/i1040gi--2014.pdf

1040A https://www.irs.gov/pub/irs-prior/f1040a--2014.pdf    Instructions https://www.irs.gov/pub/irs-prior/i1040a--2014.pdf

1040EZ https://www.irs.gov/pub/irs-prior/f1040ez--2014.pdf    Instructions https://www.irs.gov/pub/irs-prior/i1040ez--2014.pdf

2014 Tax Tables https://www.irs.gov/pub/irs-prior/i1040tt--2014.pdf
Publication 17 Tax Guide for 2014 https://www.irs.gov/pub/irs-prior/p17--2014.pdf