Your order can always be tracked on the Track My Order page. Once on the page, you can look up a single order by entering your Order Number and Order Email. You also have the option of entering your order email and each time there is a change in the status of your order you will be sent an email.
A second way to track your order is to visit USPS directly and input your tracking number on the page. However this only works if your order has been shipped via USPS. It will not work if for example you live in Canada.