Need to access previous returns to amend

I need to amend my 2019 and 2018 taxes. I am currently using the free version of TurboTax and I am receiving the message, "Amending a prior year return is not currently supported by IRS Free File Program delivered by TurboTax".  

 

How can I amend my previous returns through turbotax?  If I purchase a turbotax program, will I be granted access to amending them?