Very simple with the following shortcode:

Use in the page, post or widget: [dw_notif]

Use in the php file: <div class="dw-notif-menu"><?php echo do_shortcode('[dw_notif]'); ?></div>

Use in a menu item: [dw_notif]



At the moment, the plugin show good on the header. So, you should use the php shortcode in the header.php file or menu item shortcode.