There are several ways to add a wiki article to a Category. With one method, you can add a wiki article to multiple categories at a time. This requires you to access the Edit tab of the article you want to add.
Thus, you will need permission both to edit the wiki article and to add that wiki article to categories.
In the Edit tab, you should see a "Categories" field. This field lets you search existing categories. You can select a Category by clicking on its name in the search results.
If you have permission to create new Categories, you can create a new one by clicking the "+" icon in the search bar. You will be prompted to enter a name for the Category and a save location.
If you are unhappy with any of the categories you've selected, you can remove them by clicking the "x" next to its name in the "Selected Categories" list.
If you are pleased with all your selections, click "Save Changes" to add the wiki page to all the categories that are selected.
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