Wiki Help: Categories
Categories are lists of links to pages; so, for example, the Category:Terminology page is an automatically generated list of pages with Category:Terminology in them. Example:
[[Category:Terminology]]
So if you want to add a term, you create that page, add Category:Terminology to it, and it will automatically be added. For an example, check out Reset.
To link to a category within an article like Category:Terminology, add a preceding : to the page name. Example:
[[:Category:Terminology]]
Also, when signing your comments, use four tilde's ~ to add a name and timestamp, like this Qzjul 17:11, 27 November 2010 (UTC)