WooCommerce / Editing Product Page

Hi Peeps,

I am looking to edit the product page of a woocommerce site - which seems to be a little bit trickier than I thought. I would like to add something as simple as a button ABOVE the add to cart button.

Do I need to go finding the product page templates (php) in the editor and tinkering with them? If so where do I find them?

Is there a good way to navigate through the templates?

Thanks,
Aaron