You can find a complete list of previous orders after signing in to your Collage account by clicking the head and shoulders icon in the upper righthand corner of the home page. Make sure you're either signing in or creating an account with the email you used to place the order(s) to have access to that order(s). 

Once signed in, click the head and shoulders icon again, then click Your Orders.

You'll then find a list of your orders to check the status, discount used, order total, or purchase the product again.