For some reason with this plugin, the text “Related Articles” isn’t showing up above these even though in the plugin it is activated.

“Related Articles” isn’t showing

function jetpackme_related_posts_headline( $headline ) {
$headline = sprintf(
'<h3 class="jp-relatedposts-headline"><em>%s</em></h3>',
esc_html( 'Related Articles' )
);
return $headline;
}
add_filter( 'jetpack_relatedposts_filter_headline', 'jetpackme_related_posts_headline' );
customize-related-posts