...
Step 1: Click on this sign-up link: piazza.com/cornell/other/simcafe
Step 2: Join as a "Student", enterSimCafefor enter SimCafe for the class access code and click on "Add Classes"
Step 3: Enter your email address. Note that this will work even if you do not have a cornell.edu email address.
Step 4: Retrieve the activation code sent to you by email.
Step 5: If you are new to Piazza, set up a password for your account.