帖子中的短代码（标题缩略图）

I have wordpress with the colornews pro theme. I would like to include photo caption in every post, under the main picture. I found something like that, but I do not know how and where to add it:

<?php echo get_post(get_post_thumbnail_id())->post_excerpt; ?>

It's a pretty simple fix actually! From the developer's website:

<?php 
  the_post_thumbnail(); 
  echo get_post(get_post_thumbnail_id())->post_excerpt; 
?>

It seems that the only thing you're missing is the_post_thumbnail();