Clicking Messages opens a new page with three tabs:
By default the contact list is empty. In order to send a message or to create a shortcut to the person you are sending, go to the Search tab.
The search tab allows you to search for a person from among the students only in your course or all students registered on the platform. You can also search messages typing a keyword (in the Keywords field) and defining a few search criteria such as whether or not include blocked users or whether search only messages from (or to) you or do both.
Here you can decide on having a popup Message window whenever you get a new message, blocking messages from people who are not on your Contacts list, having an audio signal for a new message, using a HTML editor, or getting email messages when you are offline.