YouTube Preview Picture as WordPress Post Picture and in Slideshow

Hey there,

I use the “WordPress Automatic YouTube Video Posts” from ternstyle – works just fine. Now I want to go one step further and use the preview-picture from youtube as preview picture in wordpress.

I does work as you can read here: href=”https://www.ternstyle.us/products/plugins/wordpress/wordpress-automatic-youtube-video-posts/wordpress-automatic-youtube-video-posts-functions

but I don’t now in which .php file and on which place I have to put these code line:

<?php tern_wp_youtube_image(); ?>

It should work both as preview picture and in my slidshow. I don’t know where to change the post preview, but here is the code of the slidshiw.php I use:

[Code moderated as per the Forum Rules. Please use the pastebin]