Here are a few things that show confidence and authority to the audience:

  1. Make eye contact with each person in the audience, take a deep breath, and speak to them as you would to a person over a cup of coffee.
  2. Remember, it’s not about how intelligent your audience sees you, but rather how intelligent you make your audience feel. So don’t use a lot of acronyms or terminology that your audience may not understand.
  3. Make sure that they understand the context of what you are saying and why it is important to them.
  4. Demonstrate understanding of their industry, their company, or their personal situation, by giving examples and asking questions.
  5. Don’t try to have all the answers, but make sure you ask the right questions. The more thought provoking, insightful, and intriguing you are as a speaker, the more credible you will be to your audience.