Once in Catalog, you will find all your products. You can use the Filter to drill down, or you can search for a specific product by using the search bar on top. You can sort products by using the Sort by dropdown menu.

Navigate to the desired product's detail page. You will see quantity to select your quantity, then click the Add to Cart button.

Navigate to the Catalog from your dashboard to see the items available for you to purchase. Click Add to Cart to add to Shopping Cart.