1. Your audience can add questions on the Q&A tab

They can also mark a chat message as a question using the Q&A checkbox

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2. Questions appear in a list. Upvoted ones rise to the top

Each person can upvote each question once, making it easier for a moderator to see which questions are the most important to the audience

 

3. When you address a question, just mark it answered

That question will move to the Answered Questions list