If you have stayed in the US more than your Visa’s expiry date, you’re automatically staying on the ‘Grace period’ status. In order to report that accurately in your account please add a separate status under the "Visits to the US" section.
The start date for your Grace period status should be one day after the end date of the F/J status.
The end date should be either 30 or 60 days after the start date depending on the type of Grace period.
The system will then ask you how many days you've spent in the US under the Grace period and the number of days should not go over 30 or 60.