How to Hide WatchMan-Site7 Admin Menus

function plt_hide_watchman_site7_menus() {
	//Hide the "Visitors" menu.
	remove_menu_page('wms7_visitors');
	//Hide the "Visitors → Visitors" menu.
	remove_submenu_page('wms7_visitors', 'wms7_visitors');
	//Hide the "Visitors → Settings" menu.
	remove_submenu_page('wms7_visitors', 'wms7_settings');
}

add_action('admin_menu', 'plt_hide_watchman_site7_menus', 11);

Where do I put this code?