How to Change add to cart button Link ?

[Komputermanz]

hello friends,

i am very newbie about virtuemart,

i have spent many days to solve it but i cant, need your help. 

please look this first : http://www.jam-unikgaul.com/index.php?option=com_virtuemart&view=productdetails&virtuemart_product_id=4&virtuemart_category_id=2


1.  what can i do to change add to cart button to external link ? (not to cart, but to my artikel link).

2. how can i move the product description below the product image to right side below the add to cart button?

Note : i am using virtuemart 2.0.6 version

need your help, thanks you .