Thread:LucidPigeons/@comment-10876881-20150614185921/@comment-27560932-20150614192031

Go down to the bottom of the page; at the end of the category section, there's a button called Add Categories. Type in the name of the category you want (it usually fills in for you) and then enter it in. If the category already exists, the page will tell you so. Alternatively, you could just go to Wikia's Classic Editor. There's a section there on the right side of the page that also allows you to add categories if you also want to edit the actual text. If neither of those work, Wikia's glitching.