Sorry for replying late. But as you want the images to open in a popup, you need to install any plugin that does popups. Like Colorbox or prettyphoto. Then to open the images in a popup, you might need to modify a line in the plugin too (for adding a css class).
If you install the plugins, depending on the plugin, there needs to be add a CSS class in the plugin code.
In the wpuf-functions.php, line 773, there is a line like this: $html .= sprintf( '<a href="%s">%s</a> ', $full_size, $thumb );. Depending on the plugin, you'll need to add classes (prettyPhoto or colorbox may be). Just add the class there like this: $html .= sprintf( '<a href="%s" class="prettyPhoto">%s</a> ', $full_size, $thumb );
Now sem installed right, and I changed my CSS class in the plugin code.
But when I use the code, does not work.
<a href="[wpuf-meta name="slike_ponude" type="image"]" rel="prettyPhoto" title="This is the description"> <img src = "[wpuf-meta name =" slike_ponude "type = "image"] "width =" 60 "height =" 60 "alt =" This is the title "/> </ a>
This is the code that I used to activate the CSS class for pretty photo.