2.1 Click "Store Manager".
2.2 There are two tabs, "Setting" and "Products"
2.3 Click "Setting" tab, use "Edit Item" function to change your paypal account and google checkout merchant id. Also you can customize language. ONLY one record allowed.
2.4 Click "Products" tab, to change and add your product.
2.5 The "Sequence" field is the order on the public site and only the "Active" products list on public site.