You can access everything about your account from your account dashboard. Just use the "Sign In" link at the top of any page. Once you sign in, you will be automatically directed to your account dashboard or you can use the "Account" link at the top of any page to navigate there.
Then select "My Orders" on the left side of the screen where you can view your order history. If you need a printed receipt for a specific order click on the highlighted "View Order" option and then "Print Order" in the top right corner of the screen.