The person who originally creates the organization page is the owner. The owner is like a super-administrator who has all permissions, including the permission to delete the organization's page altogether and to manage the permissions of other administrators. You must be an owner in order to promote an administrator to owner status. To promote an administrator go to your organization's Dashboard and select "Administrators" from the menu on the left side of the screen. Find the name of the person you would like to promote, select "Promote to Owner," and you should be all set!