On the Slide Show tab, ensure that Use Presenter View is turned on.
On the Slide Show tab, click either From Beginning or From Current Slide to start your slide show.
In Presenter view, some helper buttons appear at the lower left corner of your slide. The one that looks like a pen determines how the mouse pointer appears to viewers:
Click that Pen button, and then choose Pen from the pop-up menu:
Click and drag the mouse to draw on the slide.
(Optional) To turn off the pen, right-click the slide, point to Pointer Options, and then click Arrow Options and choose the option you prefer.
By default, the color of the pen is red, but several colors available. To change the color of the pen:
In Presenter View, click the Pen icon at the lower left portion of the slide:
On the pop-up menu, point to Ink Color, and then select the color you want.
At the end of your slide show, when you're about to return to Normal (editing) view, PowerPoint gives you the opportunity to save your ink annotations. Choose Discard to get rid of the annotations. Choose Keep to save the ink-pen annotations on the slides.
To remove some or all of what you’ve written or drawn, right-click the slide, point to Pointer Options, and then do one of the following:
Click Eraser, and then hold down the left mouse button and drag the eraser over what you want to erase.
Click Erase All Ink on Slide to erase everything you’ve written or drawn on the slide.
Below are a list of keyboard shortcuts to start annotating your PowerPoint.
To do this
Press
Start the laser pointer.
Ctrl+L
PowerPoint 2010 and 2007: Not available
Change the pointer to a pen.
Ctrl+P
Change the pointer to an arrow.
Ctrl+A
Change the pointer to an eraser.
Ctrl+E
PowerPoint 2007: Not available
Show or hide the arrow pointer.
In PowerPoint 2010, Equal sign (=)
In PowerPoint 2010 and 2007, A
Show or hide ink markup.
Ctrl+M
Erase on-screen annotations.
E