Question about my wp ecommerce plugin

Hi I bought your ecommerce plugin which is wonderful
I just got a question
I want to bring the add to cart up in my page and make it little big or customize it with a picture
below is the page
http://www.coconutoil4health.co.uk/store/products/pure-organic-extra-virgin-coconut-oil-500ml-cold-pressed-unrefined/

waiting for your response

Kind Regards
Rashmy