With your presentation open, on the Slide Show tab, click Record Slide Show.
(The Clear command deletes narrations or timings, so be careful when you use it. Clear is grayed out unless you have previously recorded some slides.)
In the Record Slide Show box, check or clear the boxes for your recording, and click Start Recording.
More about these options:
Slide and animation timings: PowerPoint automatically records the time you spend on each slide, including any animation steps that occur, and the use of any triggers on each slide.
Narrations, ink, and laser pointer: Record your voice as you run through your presentation. If you use the pen, highlighter, eraser, or laser pointer, PowerPoint records those for playback as well.
Important: Pen, highlighter, and eraser recording are available only if you have the February 16, 2015 update for PowerPoint 2013 or a later version of PowerPoint installed. In earlier versions of PowerPoint, pen and highlighter strokes are saved as ink annotation shapes.
At the top left corner of the window is the Recording toolbar, which you can use to:
Go to the next slide:
Pause the recording:
Re-record the current slide:
If you re-record your narration (including audio, ink, and laser pointer), PowerPoint erases your previously recorded narration (including audio, ink, and laser pointer) when you start recording again on the same slide.
You can also re-record by going to Slide Show > Record Slide Show.
To use ink, eraser, or the laser pointer in your recording, right-click the slide, click Pointer options, and pick your tool:
To change the color of the ink, click Ink Color.
To end your recording, right-click the final slide, and click End Show.
Tip: When you finish recording your narration, a sound icon appears in the lower-right corner of each slide that has narration.
The recorded slide show timings are automatically saved. Timings are shown in Slide Sorter view just beneath each slide.
In this process, what you record is embedded in each slide, and the recording can be played back in Slide Show. A video file is not created by this recording process. However, if you want a video file, you can save your presentation as a video with a few extra steps.
Preview the recorded slide show
On the Slide Show tab, click From Beginning or From Current Slide.
During playback, your animations, inking actions, laser pointer, audio and video play in sync.
Preview the recorded audio
In Normal view, click the sound icon in the lower-right corner of the slide, and then click Play.
Set the slide timings manually
PowerPoint automatically records your slide timings when you add narrations, or you can manually set the slide timings to accompany your narrations.
In Normal view, click the slide that you want to set the timing for.
On the Transitions tab, in the Timing group, under Advance Slide, select the After check box, and then enter the number of seconds indicating how long the slide should appear on the screen. Repeat the process for each slide that you want to set the timing for.
Tip: If you want the next slide to appear either when you click the mouse or automatically after the number of seconds that you enter—whichever comes first—select both the On Mouse Click and the After check boxes.
Delete timings or narration
The Clear command is for deleting timings or narration from your recording that you don't want or that you want to replace. There are four different Clear commands that allow you to:
Delete the timings on the currently selected slide
Delete the timings on all slides at once
Delete the narration on the currently selected slide
Delete the narration on all slides at once
If you do not want to delete all the timings or narration in your presentation, open a specific slide that has a timing or narration that you do want to delete.
On the Slide Show tab of the PowerPoint ribbon, on the Record Slide Show button, click the down arrow, point to Clear, and then choose the appropriate Clear command for your situation.