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"
“ Sorry, I'M OFFLINE. Contents[show] Reo Hi! I am Reo, and I joined this wiki on August 3, 2013...
“ (Friend's Name) is my Best Friend ever on this wiki! (Friend's Name) is my Friend, too.