If you're already a Truman's customer, pat yourself on the back for being awesome. Then enter the email you used at checkout and create your password.
If you're not a Truman's customer, well that's OK. Procrastinators are welcome! You can create an account, but it won't do much until you place your first order. After that, you can access all of your account details - order history, subscription settings, you name it! (Literally, you name your account.)