You can still delete a form in the desktop version.
Using the TurboTax desktop editions to delete a form you have to click on Forms. When in Forms mode locate the form you want to delete on the left side of the screen. Click on the form to Open. With the form opened scroll down to the bottom of the page and click on Delete.
To completely clear everything, follow these steps.
You can delete a tax return from within the TurboTax Windows Desktop Program on the very first screen after starting the program or go to File-Open. Click on the large square icon representing the file you wish to delete (avoid clicking the blue "Continue" button). Then just hit your delete key and answer the prompt.
