Reporting unreported income from prior years

By saying I have to use the same Turbo Tax account that I used for the original tax return, are you meaning this year's TurboTax 2023, or are you saying I have to use my old TurboTax software(s) for the specific year(s) that I failed to report the specific taxes? I have completely processed my TurboTax 2023 software and am fixing to sent it to the IRS.  I am fairly sure your instructions to me for making an amendment applies to TurboTax 2023, and not to prior year's software.  But I need you to make this plain to me.  (Thanks!)

 

[I had been receiving monthly multi-page updates from my broker, including an annual "Consolidated 1099" which I took to be just 20 pages of useless information.  But, this year, in processing a normal 1099 from the broker, it finally hit me that I needed to take care of this oversight.]