To enter Sonar please use this URL: sonar.junipereducation.org to log in.
If you have forgotten your password, click the 'Forgot password?' link.
Enter your email address and click Continue. You will be sent a password reset email - follow the instructions in the email to set a new password.
If you do not receive an email it is worth checking with an admin user that you have been added as a user and that the email associated to the account is correct.