After you file

@nickythegolden You will have to enter ALL of your original return into TT before you will be able to amend it. There is no way to import your original return. The answer given but @TurboTaxLina contains this fine print.
"Please note that these instructions assume that you prepared your return using TurboTax.  Since you did not, you will want to enter the information from your return as originally filed, then proceed starting in Step 3."