If new entries in your guestbook do not appear on your site, you may have selected the option during setup to review entries before posting. If this is the case, you'll need to first approve each submission before it's posted to your guestbook.
To approve submissions to your guestbook:
Note: If you don't see the "Approve Submissions" link, you did not select the reviewing option when you set up your guestbook. To select the option that allows you to review guestbook entries before they are posted, return to the main Guestbook page and click the "Guestbook Setup" link. In step 8, select the "Review entries before posting" box, then click the "Finished" button to save your changes.