To add a new category to a page you can click the Category button at the bottom of the page and type in the name you'd like your category to be called.
A full list of existing categories can be found at Special:Categories.
|This is a very large category!|
| To see more of it, click the links below for specific letters, or click the "Next" (or "Prev") links.|
Also note that subcategories are sorted alongside articles, so not all subcategories are visible on the first page.