Display Custom Meta with Filter

I am using a theme with a custom post type. I have added an additional meta field to the post and the data is saving. I need help creating a filter to add “something”+$mymetafield+”something” to the content. I included my code to add the meta box, but I’m totally lost on using that information. Thanks

add_action('add_meta_boxes', function() {
	//css id, title, cb func, page, priority, cb func args
	add_meta_box('ftt_fanpage_url', 'Facebook Fan Page URL', 'fanpage_url', 'ait-dir-item');
});

function fanpage_url($post) {
	$fanpage = get_post_meta($post->ID, 'ftt_fanpage_url', true);
	?>
	<p>
		<label for="ftt_fanpage_url"> Full URL to Facebook Fan Page: </label>
		<input type="text" class="widefat" name="ftt_fanpage_url" id="ftt_fanpage_url" value="<?php echo esc_attr($fanpage); ?>" />
	</p>
	<?php
}

add_action('save_post', function($id) {
	if ( isset($_POST['ftt_fanpage_url']) ) {
		update_post_meta(
			$id,
			'ftt_fanpage_url',
			($_POST['ftt_fanpage_url'])
		);
	}
});

[Please post code & markup between backticks or use the code button. Your posted code may now have been permanently damaged by the forum’s parser.]