How to add a checkout button to the product view

Hello All
My problem is that the following shortcode for marketpress does not include a checkout option per each item it shows.
[mp_list_products paginate="true" order_by="rand" order="ASC"]

I I went to the code for marketpress plugin but could not find where the html is generated so that I could add this line underneath the add to cart button
Checkout Now »

That way the items would show the checkout option per each product. Before I go invoke jquery and add this to the dom the dirty way. Can someone point me towards the best practice to edit this shortcode to behave the way I want it to. Many thanks!