How do I add 3D star icons

First of all this is a lovely plugin.

I downloaded and merged together 2 3D star icons , one golden and the other fully dark. Changed their sizes as per the equivalent files in the images folder. Yet , I get an error and the images don’t appear.

Can anyone help me fix this problem. Image below.

[url=http://postimage.org/][img]http://s16.postimg.org/50ak2gnd1/star3d.png[/img][/url]
[url=http://postimage.org/app.php]windows screen capture[/url]

http://wordpress.org/plugins/universal-star-rating/