To create a shopping account, click "Account" on the top right hand corner of the page (see below).
You'll then see the option to Register for an account with your email address.
For your security, your password must be at least 7 characters and contain a mix of UPPER and lowercase letters, numbers, and symbols (e.g., ! " ? $ % ^ & ). Keep adding additional characters and/or variation until the prompt (seen below) disappears - you cannot Register until it is gone.
Once you've fulfilled all the above-mentioned password requirements, you can confirm your account!
Note: You do not need an account to place an order (with the exception of Autoship orders) - you can check out as a Guest. But creating an account and placing your orders while logged into your account, will enable you to keep track of your orders in your Order History.