// create the form to add the field for the website
function gwebsite_add_website_form() {
	?>
	<label for="group-website"><?php _e( 'Website', 'gwebsite' ) ?></label>
	<input type="text" name="group-website" id="group-website" value="" />

	<?php

}
add_action( 'groups_custom_group_fields_editable', 'gwebsite_add_website_form' );