You can use WeSchool Chat to send direct messages to your students or colleagues. This tool is especially useful when you want to have private conversations. For group chats, you can post on the Wall.
To start a private chat, click on a user's profile (for example: from the Wall or from the members box on the right of the Wall):
Then click on WRITE A MESSAGE:
You can attach a file with your message.
When a user receives your message, they will see a notification on the conversation icon.