The Miva documentation is very clearly posted on our website here:
Specifically, this file explains how to integrate Miva into your website:
Basically, all you will need to do is to place photos of your most popular products on your main index.html page with a "buy now" link. The buy-now link will take customers directly to your Miva shopping cart where they can purchase the product as well as any others that they are interested in.
The Miva storefront is your "back end" and it is where customers will purchase your products, while DesignPal is where you will create the "front end". The front-end is where you will present an introduction to your visitors. The front end is where you will introduce your most popular products with links to your store front.
If after reading the "integration" document, you still have questions - let us know and we will be happy to help.