kostisgrde on "[Plugin: WooCommerce - excelling eCommerce] cost for additional products"

hello, I have recently added woocommerce on my website, everything seems fine, except the shipping settings.
I can't find a way to add cost to additional products.
for example let's say I am selling CDs
the shipping cost for 1 cd is 3€. how can I set shipping cost of 1€ for each additional product on the order?
so if someone wants to buy 3 CDs the total shipping cost would be 5€
please help

http://wordpress.org/extend/plugins/woocommerce/