I've filed my 2020 return using TaxAct. Realized there's a mistake made and I would like to amend and file a new return. How can I proceed with this using TurboTax?

I used Tax Act (another service provider) to fil my 2020 tax returns. After filing I realized there's a mistake and need to amend using 1040 - X sheet. How can I proceed with this using Turbo Tax?