If for some reason you forget your password, you can always reset your password from the initial sign-in page!
From there, you will be prompted to enter the email address that you used to sign up with CodeHS, and reset your password. This will send an email to your account with instructions on how to reset your password!
If a student has lost their password, as a teacher, you can reset their password for them. Just go to this help article to get a detailed explanation of how to do that: http://help.codehs.com/managing-your-sections-and-rosters/how-do-i-change-my-students-passwords