You cannot use online software to prepare a 2017 return. Online preparation for 2017 is permanently closed.
The online program can only be used for 2018 returns. The 2017 desktop software must be used for a 2017 return, or if your return is simple enough, you could prepare it on paper.
2017
https://www.irs.gov/pub/irs-pdf/f1040.pdf
https://www.irs.gov/pub/irs-pdf/i1040gi.pdf
https://www.irs.gov/pub/irs-prior/f1040a--2017.pdf
https://www.irs.gov/pub/irs-prior/i1040a--2017.pdf
https://www.irs.gov/pub/irs-prior/f1040ez--2017.pdf
https://www.irs.gov/pub/irs-prior/i1040ez--2017.pdf
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