Header Addons is one of the features that you can add in Kadence by installing, activating, and licensing Kadence Pro.
To use the header addons, click on Customize link under Header Addons or visit the WordPress Customizer via the admin menu link under Appearance or the WP toolbar link on the front end.
Go to the Header section.
Note: Not all items are available in Desktop and Tablet/Mobile views.
To add one or more of these items to your site’s header, drag the item(s) onto the header builder and configure them to your liking.