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.
Pages in category "Browse"
“ To anyone who sees this blog, you should know it's come to my understanding that there's been a...
“ Pages in this category have been labelled for deletion. To add a page to this category, type...
Candidates for deletion
“ Doug! My favorite pages Add links to your favorite pages on the wiki here!, Favorite page#2...
“ For a full list of help pages, see Help:Contents, which includes help pages shared across Wikia.