1. Make sure you're a Presenter and the Host Control Panel
2. Inside the Host Control Panel, click on the switch to Enable or Disable the Public Chat.
3. If the switch is GREEN, the Public Chat will be on. All attendees will be able to freely chat. If it is GREY, the Public Chat will only work for Presenters. Attendees will see their chats, but will be unable to chat back.
4. Turning off public chat still allows for attendees to chat PRIVATELY with presenters by click on the people tab, and clicking CHAT. Only the presenter being chatted with can see this.