After you complete the amendment process complete the FILE tab again and choose to mail in the return then the correct forms and instructions will be populated.
Amend your 2019 return if you need to change or correct something after you already filed it.
Keep in mind: You have 3 years from the date you filed your 2019 return (or 2 years after you paid the tax due, whichever is later) to file an amended return.
