remove Remove Add to Cart button in wpsc_product_category

Hi, Cane someone please tell me where to remove Add to Cart button in wpsc_product_category? I am using Twenty Fourteen with the basic WordPress e-commerce.
I have 3 products in this catagory which are customisable. Add to cart bypasses this option.
I need to remove Add to Cart to force the visitor to click on an individual product which then shows individual product which has customise your product.

I guess I would need to add the changed file to my child theme?

Thanks
Links to pages.
https://eastbournefhs.org.uk/wp/?wpsc_product_category=membership-join-renew
https://eastbournefhs.org.uk/wp/?wpsc-product=overseas-membership