When you select Record Narration from the Add Audio button on the toolbar, the Insert Narration dialog will open. Once you are finished recording your narration, click the Add button to add it to the current slide.
Capture from
Select the microphone you're using from the drop menu.
MP3 Settings
Click this button to configure settings for the recording. Narrations are recorded as MP3 files.
Recording Controls
Click the red record button to begin recording. Click the stop button when you are finished. Play back the recording by clicking the play button. The pause button will pause both a recording or playback.