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<?php 
acf_form_head(); // Place this before wp_header();
$options = array(
	'post_id' => 'user_'.$current_user->ID,
	'field_groups' => array($form_group_ID), // $form_group_ID is the post id of the form group to show.
	'submit_value' => 'Update Profile'
);
echo '<p>Your username is <b>'.$current_user->user_login.'</b>. This cannot be changed.</p>';
acf_form( $options ); // http://support.advancedcustomfields.com/forums/topic/front-end-and-custom-user-meta/
?>