After you file

Where is your original return?  Do you have the .tax2021 file on your computer?  You need to first open that return.   Or when you click on Amend doesn't it look for the 2021 return?  It should find it or let you browse to where it is.  Are you on Windows or Mac?  

I'm on Windows and started my 2021 program.  It should show your return in a big box at top and say Continue on it.  Then I clicked on Amend at the bottom and the Continue button changed to Amend.  I made a screen shot

You can switch to Forms mode to see what it is filling out.  

Don't you get this far?