After you have created some products, click the "Products" tab to edit them. To find certain products, you may search for them by sku using drop-down menu. Or you may enter a keyword in the keyword search box (or leave the search box blank to display all products).
Thumbnail Loading and Image Selection Settings
The Thumbnail Loading and Image Selection settings have clear descriptions. They help the Shopping Cart module load better if your cart has a lot of products. Otherwise, the default settings should be Ok.