As soon as you confirm your purchase by clicking on Complete order, your order will be placed into the system. You can find its record in the Order history section by clicking on the icon of your account. The order cannot be edited, but you can use it again in your next purchase. You can make your shopping easier by clicking on Re-order right next to each item of your previous order.  The items, which are not currently in stock, will not appear in your new order.