To record a narration to add to your slideshow press the "Narrate" button. The "Edit Slide" dialogue box will pop up and you can then click the red button to start recording and speak into your microphone. To stop the recording click the button again.

If you wish to redo the narration just click the record red button, discard your previous narration, and go through the recording process again.

To adjust you sound record device settings press the "Microphone Settings;" button.

You can also attach a previously recorded sound narration file to your slideshow. Either click the "Browse" button or check the "Load narration file" box.