1.) Hover over teammates to see the option to 'Drop in' to the left (phone icon) and to 'message' (chat bubble icon) on the right.
2.) To message a teammate, hover and tap on the 'chat bubble icon' and a chat window will open. If the user is offline, you can still send a message and they will receive an email. Default text is shown in the chat modal if you'd like to just send a quick request to chat.
3.) When a teammate receives a new message, a notification sound and a red dot will appear next to the teammates profile, indicating a new message has been delivered: