I was notified that my 2018 tax return was rejected because my 2017 tax was rejecterd. I need to fix the 2017 income with a w-2 I had forgotten

[Critter]

You have 2 situations ... 

2018 ... it was rejected due to the incorrect AGI not income ... and if you cannot fix it you will need to mail in the return ...    https://ttlc.intuit.com/replies/5595742

2017 ... you need to amend it .... https://ttlc.intuit.com/community/amending/help/how-do-i-amend-a-return-in-turbotax/00/27372

[VolvoGirl]

If your 2017 was rejected you do not amend.  Just fix it and add the missing W2 and mail in an Original return.  

How to finish a prior year online return   https://ttlc.intuit.com/community/prior-year-return/help/how-do-i-finish-a-prior-year-return-that-i-...

Then for 2018.......if you didn't file a 2017 return try using 0 zero for the AGI to efile 2018.