To Edit a contact, including the Administrator number, go to the main menu in the App.

Tap on Family List

Press the screen on the contact number you wish to change until the edit page is displayed.

Tap on the number and correct it.  (Remember to use the international dialling code when adding contact numbers).

Or if you wish to Delete a contact number, choose the delete option.

Tap on OK and exit out of the Family List screen.