want to add Subtitle

Hello,
I created a subtitle custom field to my posts titles, to be displayed before the main title loop in Single-post and Index etc…
my problem is that I don’t know where to edit that in FA lite!

I am using normal custom field php line to call the subtitle:
<h1><?php
{ $subtitle = get_post_meta
($post->ID, ‘subtitle’, $single = true);
if($subtitle !== ”) echo $subtitle;} ?></h1>

What should I do to make it appear in the slider?

Thank you

https://www.ads-software.com/plugins/featured-articles-lite/