OBSERVE

Commons welcome page: http://commons.wikimedia.org/wiki/Commons:Welcome

Top level commons categories: http://commons.wikimedia.org/wiki/Commons:Categories

Category of media needing categories: http://commons.wikimedia.org/wiki/Category:Media_needing_categories

DO

Your task is to add categories to 3 media files on Commons. Log in to commons (enable global log-in if necessary). The easiest way to add or modify categories is to use HotCat which, by default, needs to be enabled in Preferences.