Thread:BunsenH/@comment-28858167-20161010171917/@comment-24577221-20161010185546

If you edit the page with the original editor, there's a list of categories. If you put the mouse/pointer over each of them, there's an icon to delete it. With the visual editor, when you edit the page, there's a drop-down list beside the "Cancel" button. That drop-down list has a "Categories" item, which shows a list of the categories. If you click on a category, there's a garbage-can icon which deletes the category from the page.