Thread:YumenoUkihashi/@comment-18006806-20150213180704/@comment-25523655-20150213182919

It's the same as creating a normal page, except that you put User:Ookami S/Wikia.css as the name of the page. (In case you're not familiar with how to create a page, click on the "Contribute" drop-down menu on the top right, choose "Add a page," and voila.)