Require users to choose a post category before saving a draft or publishing. After activation all users will be required to choose a category before saving a draft, updating a post, or publishing a post. This applies to normal posts only, not custom post types. If you are a developer you may modify the plugin code to fit your custom post type needs.
- From your WordPress admin go to Plugins > Add New
- Search for “require post category“
- Click the Install Now link for Require Post Category
- Download Require Post Category from the WordPress plugin repository
- Extract the file to your
- Activate the plugin