To reset the password for a teacher, go to the 'Teachers' tab from the 3 lines menu in the top right hand corner of Class Charts. After you have done this click 'Set Password'.
This will open a pop up window where you can enter a new password for the teacher. When you entered a password click OK. This will then send the new log-in details to the teachers email as listed under the 'Email' heading in the teachers tab.
Never disclose passwords to a third-party.