Board Thread:Support Requests - Getting Started/@comment-25405983-20150420163921/@comment-25980608-20150420210150

I think there's a couple ways to do it. I think the easiest way is to create a page for the category you want, like http://discordia.wikia.com/wiki/Category:Catsthatfly (instead of discordia use the name of your wiki, and the last word is your category name). Then you can click Create or click "Add to this Page!" Type in something like "This category is for cats that fly." Then when you add the category to an article, that category will already exist. :)