Step 1: Go to the course page and click the "Reports Tab".

Step 2: From the drop-down select the course participation.

Step 3: In the Activity module, select "Quiz" and "Student", in Actions select "Post".



Step 4: In the list that appears, tick/check the boxes next to those you wish to message. The column Post "No", means that the Student did not participate.

Step 5: In the bottom dropdown "With selected users...", choose "Send a message"

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Step 6: Type your message and click the 'Send' button.