Please make sure that you are attempting to sign in with the email address used when the account was created. If you did not create an account whenever you placed your order, please click (forgot password?) and use the email that you used when you placed the order. This will send you an email with a temporary password in order to log into your account and look at your order history.
Once you have signed in, click on "My Account" in the top right corner, then click "Order History". This will show the default view of orders from the last month, but you can change this view with the drop down menu on the right side of the screen.