Adding Content Area below Product Detail Class

I would like to add a content box area below the Product Detail Class section

Here is the product page of my website

http://squarepegaccessories.com/store/products/carsons-water-lily-scarf/

I would like to add the following:

1) A content box I can put information in that will show up below the product detail class

I would like it to look like this website:

http://carsonandco.com/shop/british-fern-scarf-aqua/

Notice the add cart button on the right (I know we have a Quantity section, which we will keep).

I would like to have the content area below the Add to Cart Button like the website above.

Thanx <3