Anyone 18 years and over can sign up on HMH Marketplace for free.
If you already have an account on hmhco.com, you can use your existing username and password to log in.
If you don't have an account yet, click "Sign up for Free" in the top navigation menu.
You'll be asked for First Name, Last Name, Display Name (that will be visible to others), Email, and a Password.
Then click "Create your Account."