In the PowerPoint ribbon, Go to Slide Show tab and click on Record Slide Show button. Choose the option Record from Beginning to add narration for the entire slide presentation.

How to Add Text-to-Speech in PowerPoint. To make sure every single person in your audience understands what you present in the Microsoft Office PowerPoint 2010 presentation, you can use the text ...

If you wish to include useful information that should only be visible to you (the speaker) during your next PowerPoint presentation, here's how to do that.