gistfile1.php

<?php
// put this in functions.php or an include file
add_action( 'init', function() {
  $fm = new Fieldmanager_Group( array(
		'name' => 'contact_information',
		'children' => array(
			'name' => new Fieldmanager_Textfield( 'Name' ),
			'phone_number' => new Fieldmanager_Textfield( 'Phone Number' ),
			'website' => new Fieldmanager_Link( 'Website' ),
		),
	) );
	$fm->add_meta_box( 'Contact Information', array( 'post' ) );
} );