Customizing Wiki

I have played with this a little and just can not seem to get it to work. I want to include the following just below the title of the single wiki.

<?php $customfield_name = get_post_meta($post->ID, '_ct_text_4e60c64d69a90', true);
if ($customfield_name == '') { ?>
<?php } else { ?>
<div align="center"><?php echo get_post_meta( $post->ID, '_ct_text_4e60c64d69a90', true ); ?></div>
<?php } ?>

Can you tell me how I am able to do this?