How do I send a message to my class?
You may be able to send a message to your entire class without having to select recipients one at a time.
If you cannot send a message to your entire class, your institution has restricted this feature.
Click the Compose icon to start a new message.
In the course drop-down menu , select the course where you want to send a message .
Open Address Book
Click the address book to send a message to the entire class.
Click the name of the course.
In the subject field, add a subject for your message . If you do not want a student to see all recipients in the message, click the Send individual messages checkbox . Type your message in the message field . You can also add attachments to your message . Click the Send button  when you are finished.