[ndut]

hello.. can somebody help me, please..

i've tried to try this cool add ons.. but it doesn't work..
i've followed this script step by step... still no working..

i'm using vbulletin 3.6.8
i've put file attachment_watermark.php into my root forums folder
i've put file watermark.png into my images folder..
i've install the product-attach_watermark.xml Product via the vBulletin AdminCP Product Manager. still not working..

what should i type in "Watermark Image Location"
if my images. i stored in httpdocs/images folder..
fox example.. my site names is : www.ndut.com
now, i type : /ndut.com/httpdocs/images/watermark.png
but, doesnt work..

can somebody help me?? thanks before..