This article applies to the 123-reg InstantSite package.
This article will explain how you can add a new category to 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.
In the Site map panel, click on the Forum page.
Click on the Categories tab.
Click on the Add New Category icon.
Enter the name and description of your category and click on the OK button.