Category talk:Silly "Earth" theories

How does one "add a category"? I don't see anything in the edit page. *confused*Roo (talk) 18:06, 11 April 2014 (UTC)
 * Add a category to what? if you add to a page, MediaWiki will add it to a category named "Something" even if the page Category:Something does not exist.--ZooGuard (talk) 18:10, 11 April 2014 (UTC)