Why can't you use the Desktop program to amend? You need to start with the original filed return. You should not amend until the first return has fully processed and you get the first refund or your tax due payment has cleared.
You start by just opening your return as usual. Go up to File-Open. You need to have the .tax2023 file on your computer.
Also you first need to check the filing status inside the program so it knows it was filed and accepted. Open your return and go up to the top black menu bar first item
File > Electronic Filing > Check Electronic Filing Status
Then save your return and close it. Close the program and reopen it.
If you don't see a button for Need to Amend a Filed Return? on your home screen then you can get to it here. Go to:
Federal Taxes -or- Personal (for H&B)
Other Tax Situations
last section, Other Tax Forms
Amend A Return - Click the Start or Update button
