add a " add to cart" button to each product in a summary block-

 I am new to 7.1 and using CSS code. 

I have a two small stores (Tinytreks.com) and I use summary blocks to offer the products . I want to add a " add to cart" button to each product in a summary block- but it is not offered, like it is on a product page. Is there a way to add code to do this? If there is code, how do I add it to show it on each product

I see some posts, you can try