This article applies to the 123-reg InstantSite package.
This article will explain how you can remove a category from your Forum page.
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.
Click on the Forum page in the Site map section
Check the tick box next to the relevant topic you would like to remove and click on the Remove selected tab.
Click on the OK button to confirm removal.