How do I amend my 2018 taxes and add a foreign earned income exclusion using the physical presence test? I can't figure out how to add the form 2555.

When I filed my taxes in 2018 I was not able to claim foreign earned income exclusion because I had not yet met the 330 day requirement for the physical presence test and could not use the bona fide residence test. So I filed the taxes normally, even though my income from July-December was earned while I lived overseas. I went on to live overseas from (as I said) July 2018 all the way through 2019. So now, because I can meet the 330 day requirement, I want to go back and amend my 2018 taxes and claim the FEIE.

Am I able to do this? How do I do this? When I try to do so on the turbotax interface I can't see any way to.

Thank you for any help.