Direct messages are the best way to privately communicate one on one with other students on Learn.
If you are looking to send a direct message or open a previous DM conversation, there are a couple of ways to initiate.
1. You can search for another student via the DM icon at the top right of the Learn header:
2. You can also hover over student avatars in different locations across Learn to reveal a hover card that includes a button to initiate a direct message: