The current online product is only for tax year 2018. To prepare a 2017 tax return, you must buy, download and install on a computer the software for the 2017 tax return. Here is where you can buy it: https://turbotax.intuit.com/personal-taxes/past-years-products/
A 2017 tax return must be printed, signed and mailed. It cannot be efiled. You should mail it using a tracking service so that you know for sure that the IRS and your state received it. Federal and state must be mailed in separate envelopes since they go to different taxing bodies.
