1040x

I use the free file program to file my 2020 return   Now I need to file a 1040 x to add my ira distribution and taxes withheld to get my refund.  How can I e-file an amended return?  When I go to last year's website, for amend return, it says "Amending a prior year return is not currently supported by IRS Free File Program delivered by TurboTax".  I have purchased the turbotax 2021,  but there is no option for 2020 1040x.  Please help.

Thank you, Jane