In 3 Easy Steps
Step 1:
In your control panel, choose "Approval" feature on the Guest Book page.

Step 2:
In the approval feature you have two types of entries: (1) Entries waiting to be approved and displayed on your website and (2) Entries already being displayed which you can choose to edit, delete or remove from the website.

Step 3:
On a pending entry, click "Display on Website"