webmato

Exactly! You have to put it inside your template files.

for example inside:

<?php while (have_posts()) : the_post(); ?>
  <article <?php post_class(); ?>>
    <h1 class="entry-title"><?php the_title(); ?></h1>
    <div class="entry-content">
      <?php the_content(); ?>
    </div>
  </article>
<?php endwhile; ?>

use this code from FAQ :

<?php while (have_posts()) : the_post(); ?>
  <article <?php post_class(); ?>>
    <h1 class="entry-title"><?php the_title(); ?></h1>
    <div class="entry-content">
      <?php
      if ( function_exists( 'lazyload_images_add_placeholders' ) )
        $content = lazyload_images_add_placeholders( get_the_content() );
        echo $content;
      ?>
    </div>
  </article>
<?php endwhile; ?>

now it works for me 🙂