How to edit the post categories in WordPress?
To make your website's post management easier you can add categories to them. To add new categories or to edit/delete existing ones, navigate to Posts > Categories.
To add a new category, type its name in the Name field. If you want, you can also type a category description and select parent item. Finally click the Add New Category button to create your new category. It will appear in the list of categories on the right.
To edit or delete a category from the existing ones, find it in the list of categories on the right and hover your mouse over it. Then click the Edit or Delete button to edit or delete, respectively.