Remove thumbnail from posts

Hi guys,

I’ve read many posts on this, but none of them helped…This is my site: atlasdoartista.com.br

I can’t take the thumbnail off the post page. I’ve tried editing the single.php, the content_gallery.php, and nothing works.

I’ve tried removing this:

<?php
}
else {
$image = wp_get_attachment_url( get_post_thumbnail_id($post->ID) );
$thumb = enchant_resize($image, 719, 350);
if($thumb != ”) { ?>
<img src=”<?php echo esc_url($thumb);?>” class=”post_photo” alt=”<?php the_title();?>”>
<?php }
}
?>

but I don’t know what else to do…can you please help me?
Thank you SO much!
Luiza