Problem with web2feel theme

My website is real-estate-tipz.com. I have a problem with the slider in the theme called zherald. I have created a post, i inserted the picture in the post, gave it a title, and when i post it, it doesn't show in the featured picture slider. I want to mention that i ave selected the category "pictures" for featured pictures (it is an option in the theme) and the post is in the specifed category, but no picture is shown.

 

You need to add a custom field to each featured post. Put "preview" in the key field and a link to the picture in the value field.

This part of glide.php is where the pictures are added to the slider:

<?php $preview = get_post_meta($post->ID, 'preview', $single = true); ?>
<img src="<?php bloginfo('stylesheet_directory'); ?>/timthumb.php?src=<?php echo $preview; ?>&amp;h=230&amp;w=640&amp;zc=1" alt=""/> 

Code (markup):

 

Thank you, Worked! Admins may close the topic

 

That old way of adding a picture is really dodgy. If you have lots of pictures, you may want to use the new system.

Thanks for the rep.