@Anonymous
Or could it be this?
You didn't mention whether you had filed a 2018 return or not. Since we don't know what you are doing, did you already file a 2018 return last year with TurboTax, and now need to amend the 2018 return to add the 2018 Form 1099? If so, we can tell you how to amend a 2018 return you filed previously.
