Click on each speaker icon and, on the Audio Format tab, select Start > Automatically so that the audio will start automatically when the slide opens. Each slide will now have a speaker icon.Click Yes to indicate that you want to save the slide timings.When you're done, click End Show in the upper left.You can use any browser to convert from PDF to Microsoft PowerPoint online, so you can keep work moving wherever. Make sure you get it perfect before moving on as it's a pain to edit later. Go from a PDF to a PPTX file in record time. If you make a mistake, just click the rewind button for that slide and re-record the narration for that slide. How to Narrate a Presentation in PowerPoint on a Mac On the Slide Show tab, click Record Slide Show : The presentation will start recording right away, but.