How to send short messages through school newsletter

LZ is a text message sent by a parent or a teacher's parents: it means that parents reply to the teacher by sending a text message. After receiving the text message sent by the teacher, they can reply directly, but there will be an information fee. The teacher sends a message: that is, the teacher sends a message to the parents through the computer, and the school newsletter administrator will give the teacher the website, platform account number, password and login. General account managers will give platform training to school teachers.