How do I amend 2020 return to enter Foreign tax credit Carryback?

[rifi]

I posted this question in the Credits section yesterday, but I received no response - it concerns amending prior year’s return:

I just completed my 2021 tax return. Turbotax tells me I should amend my 2020 return to apply (to enter) a foreign tax credit carryback for which I am eligible.

I searched in the Community to find out how to do this. I followed the "Best Answer" instructions for amending a 2019 return. I revisited the Turbotax interview for 2020 Foreign Tax Credit, and answered "yes" to "do you have any carryovers?", but I found no box where I could enter a carryback $ amount   (as the "Best Answer" indicated I would, had I been trying to ammend my 2019 return). No  prompts mentioned  "carryback"

[ErnieS0]

Try the instructions listed in Foreign Tax Credit - "Carryback" Option Missing.

There is no way to name a country "Carryback" as listed in the instructions so you should use the same country that generated the 2021 tax credit.