How to Hide Geoflex Admin Menus

function plt_hide_geoflex_menus() {
	//Hide "GeoFlex".
	remove_menu_page('edit.php?post_type=geoflex');
	//Hide "GeoFlex → All Regions".
	remove_submenu_page('edit.php?post_type=geoflex', 'edit.php?post_type=geoflex');
	//Hide "GeoFlex → Add New".
	remove_submenu_page('edit.php?post_type=geoflex', 'post-new.php?post_type=geoflex');
	//Hide "GeoFlex → Settings".
	remove_submenu_page('edit.php?post_type=geoflex', 'settings');
	//Hide "GeoFlex → Support".
	remove_submenu_page('edit.php?post_type=geoflex', 'support');
}

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

Where do I put this code?