If you have an IP PIN to enter and you filed without it then expect the return to be rejected and they you can make the correction and refile the return.
If you have a 6-digit IP PIN to enter, here's where to enter it.
· FEDERAL TAXES tab. (or Personal tab in Home and Business)
· Then sub tab "Other Tax Situations."
· Scroll down to "Other Return Info".
· Find subtopic "Identity Protection PIN", and click START.