Image size

How can I show the featured images in full size? I have adjusted this piece of code but no result. Thanx.

/* This file handles single entries, but only exists for the sake of child theme forward compatibility.
genesis();

  if( class_exists('Dynamic_Featured_Image') ) {
    global $dynamic_featured_image;

    $featured_images = $dynamic_featured_image->get_featured_images();

    foreach($featured_images as $featured_image) {
            $fullSizedImage = $dynamic_featured_image->get_image_url($featured_image['attachment_id'], 'full');
               echo "<img src = '" . $fullSizedImage . "' />";
        ?>
        <a>" rel="rings" rev="<?php echo $fullSizedImage ?>"><img width="300" src="<?php echo $featured_image['full'];?>"/></a>
    <?php }

    }

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https://www.ads-software.com/plugins/dynamic-featured-image/