Amending a return using software on my computer (not importing return to be amended)

I am trying to AMEND my 2019 return to add income (and taxes on that income).  When I follow the directions, which include going into the program and SEARCHING on AMEND, I go in a circle that brings me back to the instructions I found. 

 

I have my original return.  I have that return duplicated with the changes needed, but I don't know how to get it to subtract out what I have already paid.  If I start a new return, it asks me for all the information that is already in the return I filed (W2, name, etc.). I should not have to put in all the info again.  Please advise.  Thanks!