If you did not file a tax return for 2017 at all, then use zero for the AGI in order to e-file your 2018 return. If zero does not work then you have to print, sign and mail your 2018 return.
https://ttlc.intuit.com/questions/4501187-where-can-i-find-my-prior-year-2017-return
You can get a free transcript from the IRS:
https://www.irs.gov/individuals/get-transcript
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
