This article applies to the 123-reg InstantSite package.
This article will explain how you can change the page details within InstantSite
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 Edit link.
Select the page you want to edit the details for in the Sitemap panel.
Edit your page details and click on the Save Changes button.