You can add additional admins to your guestbook by pressing the Members button.
Each member you add will receive a welcome email enabling them to sign-in to view your guestbook.
Members are able to watch, edit, delete and move videos in the guestbook. They can also edit the Guestbook Settings, along with creating a gallery or compilation video. So, they join you in having full administration privileges.
Members will also receive notification emails when a new video is uploaded (if you have this setting turned on in Guestbook Settings).