1) If you forgot your password click the "Forgot Sign In" link on top right hand portion of screen.
2) Fill in email address used to sign up account and click the "Send Sign In Information"
3) Check your email for sign in information.
If the system is still now allowing you to successfully sign in, it could be due to the user account being locked. This can occur based on too many login attempts. Please contact support to have your account reactivated.
If you need help logging in read more here on how to sign in.