Can I file my 2017 taxes on Turbotax?

To do a prior year return you have to buy the Desktop program here,  https://turbotax.intuit.com/personal-taxes/past-years-products/2017  You will need a full Windows or Mac to install it on.

How to prepare a prior year return

https://ttlc.intuit.com/community/using-turbotax/help/how-do-i-prepare-a-prior-year-tax-return/00/25984

Or If you have a simple return You can fill out the blank forms for free.

Here are some blank forms & instructions for 2017

1040 https://www.irs.gov/pub/irs-prior/f1040--2017.pdf     

Instructions https://www.irs.gov/pub/irs-prior/i1040gi--2017.pdf

1040A https://www.irs.gov/pub/irs-prior/f1040a--2017.pdf    

Instructions https://www.irs.gov/pub/irs-prior/i1040a--2017.pdf

1040EZ https://www.irs.gov/pub/irs-prior/f1040ez--2017.pdf    

Instructions https://www.irs.gov/pub/irs-prior/i1040ez--2017.pdf

2017 Tax Tables https://www.irs.gov/pub/irs-prior/i1040tt--2017.pdf

Publication 17 Tax Guide for 2017 https://www.irs.gov/pub/irs-prior/p17--2017.pdf

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.