The IP PIN Is not entered in that section that you tried. It sounds like are you on the Signature screen, where you are supposed to sign the return by choosing a 5-digit PIN (any 5 digits), and entering "today's date" and "birth date."
The 6-digit IP PIN is not entered in the File Section. It's entered in the Federal Taxes section by going to "Other Tax Situations" then subtopic "Other Return Info." A shortcut for Online TurboTax was provided by Champ ee-ea in a FAQ above. If you can't find it by that method, or if you are using desktop TurboTax and can't find it, report back for more assistance.
