Show custom field

I have some custom field in post like subtitle, i use a plugin (custom field template to create it and add it to single.php with this code:

<?php
						$subtitle = trim(get_post_meta($post->ID, "Subtitle", true));
						if(strlen($subtitle) > 0) { ?>
					<div class="subtitle"><?php print $subtitle; ?></div>
					<?php } ?>

page example http://provalombsoc.altervista.org/la-norma-tra-vincolo-e-opportunita/

but is not showed in print and pdf, i try to add <p class=”copyright”> but he don’t help, there is a way to include it? thanks in advance

https://ww.wp.xz.cn/plugins/printfriendly/