How to Hide WooCommerce Coupon Popup, SmartBar, Slide In | MyShopKit Admin Menus

function plt_hide_myshopkit_popup_smartbar_slidein_menus() {
	//Hide "MyShopKit Popup SmartBar SlideIn Dashboard".
	remove_menu_page('mskpss_dashboard');

	//Hide "Smart Bars".
	remove_menu_page('edit.php?post_type=mskpss_smartbar');
	//Hide "Smart Bars → All Items".
	remove_submenu_page('edit.php?post_type=mskpss_smartbar', 'edit.php?post_type=mskpss_smartbar');
	//Hide "Smart Bars → Add New Item".
	remove_submenu_page('edit.php?post_type=mskpss_smartbar', 'post-new.php?post_type=mskpss_smartbar');

	//Hide "Popups".
	remove_menu_page('edit.php?post_type=mskpss_popup');
	//Hide "Popups → All Items".
	remove_submenu_page('edit.php?post_type=mskpss_popup', 'edit.php?post_type=mskpss_popup');
	//Hide "Popups → Add New Item".
	remove_submenu_page('edit.php?post_type=mskpss_popup', 'post-new.php?post_type=mskpss_popup');

	//Hide "Slide In".
	remove_menu_page('edit.php?post_type=mskpss_slidein');
	//Hide "Slide In → Slide In".
	remove_submenu_page('edit.php?post_type=mskpss_slidein', 'edit.php?post_type=mskpss_slidein');
	//Hide "Slide In → Add Page".
	remove_submenu_page('edit.php?post_type=mskpss_slidein', 'post-new.php?post_type=mskpss_slidein');
}

add_action('admin_menu', 'plt_hide_myshopkit_popup_smartbar_slidein_menus', 11);
Where do I put this code?