Sending Mass Messages
Begin by clicking on Participants located on the left side of your screen.
From there, you will want to use the drop down menu and select Role: Student.
Now scroll down to the bottom of the page and in the middle you will see the button Select All; make sure you click it.
Then use the With selected users... drop down menu and click on Send a message, which is highlighted above.
Type out the message you want every participant to receive and when ready click send!