Translations:Help:VisualEditor/User guide/91/en

To add a category for a page, type the name of the category into the field "$apply". As you type, the visual editor will search for possible matching, existing categories. You can either select an existing category, or you can add a category that doesn't yet have its own category page. (Until that category page is created, your new category will show as a red link after you save all your editing changes.)