Unable to use artsexylightbox

Hi,

I am trying to use the free version of Art Sexy Lightbox. (Lite).
Installed the extention, made sure the plugin was enabled.. but when i type thid onto the article (code view)

{artsexylightbox path="images/products/Guides/LX"}{/artsexylightbox}

all i get showned on tne browser is exacly the code line and nothing else.

please help.