In case, you wish to approach any other fellow members and ask them discreetly about- e.g. 'when our class starts', 'do you happen to have any learning materials for computer science' or perhaps to say 'hi' to them, then you can do this by clicking on the 'Members' area and then messaging the relevant user.

How to message someone privately? 

Simply, hover your mouse icon, (from the top left-hand-side of the dashboard), and select the 'Members' option.

From the 'Members' search section, you could either type the member's name or else you could scroll down and manually find them. (Screenshot has been enclosed).

Once you find the relevant user, whom you wish to interact with, then click on the 'Message' icon.