Using in-meeting chat
In-meeting chat allows you to send chat messages to other attendees within a meeting. You can send a private message to a single attendees or a message to all attendees.
The chat windows opens on the left, type in your message and press "Enter" (or click the "Submit" icon).
When new chat messages are sent to you or everyone, the "Chat" icon in your meeting controls will show the number of new messages.