In your guestbook page you can do several things.

COMMENTS: Your customers can leave comments regarding your services or store.

MODERATE: You can have it post right away or be notified so you can view and approve it before it goes live for public viewing.

BE NOTIFIED: You can choose to be notified by email if someone post a comment or reply to your comments.

DISCUSSION: You decide if you want to permit further comments on a post.