How to Hide MapPress Maps for WordPress Admin Menus

function plt_hide_mappress_google_maps_for_wordpress_menus() {
	//Hide "MapPress".
	remove_menu_page('mappress');
	//Hide "MapPress → Settings".
	remove_submenu_page('mappress', 'mappress');
	//Hide "MapPress → Maps".
	remove_submenu_page('mappress', 'mappress_maps');
	//Hide "MapPress → Support".
	remove_submenu_page('mappress', 'mappress_support');
}

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

Where do I put this code?