How to Create Custom Field Below Post using CustomPress

I am super confused by Custompress.

I want to create a field below the Product_meta_details (where the Add to Cart Button & categorized in section is) on my Gridmarket Theme.

Please visit that link above to see what I am talking about.

I want an area where I can put text on a product to product basis.

So if I wanted to give some additional information on shipping or ordering on that specific product, I would want that info to be in between the footer and the "Add to Cart" or Product-meta-details area

A little help here with CustomPress