This article applies to the 123-reg InstantSite package.
This article will explain how to add a Guestbook to your InstantSite package
Scroll down to the Create your website section and click on the InstantSite icon.
Click on the Login button next to the relevant InstantSite package.
Click on the Pages link.
Click on the check box next to the Guestbook page and click on the > button to move the page to your created site structure.
Click on the Save Changes button.