PHP code for Template add Custom Field

This plugin is very nice, but has little documentation.
This is a help in getting started …
php code in the template with the addition of custom field
recovered from the pages related.

<?php
	$related_posts = MRP_get_related_posts($post->ID,false, true, 'yourPostType');
	foreach($related_posts as $key => $value) {
	$related_post = get_post($key);
	$custom_field = get_post_meta($related_post->ID, 'yourCustomField', true);

	echo get_the_post_thumbnail($related_post->ID, 'thumbnail');
	echo '<br>';
	echo $related_post->post_title;
	echo '<br>';
	echo $related_post->post_content;
	echo '<br>';
	echo get_permalink($related_post->ID);
	echo '<br>';
	echo $custom_field;
	echo '<br>';
	echo '<hr>';
	}
?>

https://www.ads-software.com/extend/plugins/microkids-related-posts/