Remove product link on [product] shortcode?

I am making my own customized page for showcasing woocommerce product. I wish to remove the product link on the image with only Add to cart button active.

Please see a sample page: http://www.gbvalley.com/store/coolpad-7020/

For now, people could click on product image and get taken to the woocommerce product page. I’m using a 3rd party theme and woocommerce product page doesn’t have the look I like.

Could you point me to the file that I should edit on?

wordpress v3.6 woocommerce v2.0.13

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