@colcamper Critter-3 is correct. The software version of the 1040X is not available yet and will not be available until March 25. You have to wait for it----unless you would like to print the paper 1040X and prepare it by hand to mail in.
https://www.irs.gov/pub/irs-pdf/f1040x.pdf
Expect the IRS to take 4- 6 months to process your amended return.
**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.**
