If you were working on a 2017 return you had to be using 2017 desktop software--you were not using the online program, were you?---so of course you can make changes and then print it out again with the corrections. The return cannot be e-filed. It has to be signed and mailed.
You are posting from TurboTax Live Self-Employed--which is ONLY for a 2018 return--you did not use it for a 2017 return, we hope.
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