After you file


@richfng wrote:

I used TT Deluxe from Costco and can't see on the program where I can amend my return.


If you are using the TurboTax desktop CD/Download editions -

 

Continue the tax return you want to amend 

Click on Federal Taxes

Click on Other Tax Situations

Under Other Tax Forms

On Amend a return, click on the start button