Board Thread:Support Requests - Community Management/@comment-61573-20160912024944/@comment-24055022-20160912032205

That's not how you create a category. When you press the Add a Page button, you type in Category:Main Characters and then press create. 24 hours after you add it to a page, it'll start to show up on the category box without having to type out the whole thing. See Help:Categories for more options.