Annotating a presentation can be really beneficial in the middle of a presentation. With annotation, you can draw underlines, circles, arrows or other shapes directly on your slide show using your mouse. It’s great for highlighting points you’re speaking about.
Choose Slide Show: View Show from the Menu bar
On any slide, right-click
Figure 28. Slide Show Pointer Options
3. Choose Pointer Options
4. Click Pen or Highlighter
5. Click and draw with your mouse