You can record narration any of the chapters. It can be useful for example for a live presentation. 

Use the editing mode and press the "Record narration" button on the right side of the chapter. 

After pressing the "Record narration" button you will get into the playing mode, where you can find "Start recording" button at the bottom right. 

When you finished your narration press "Stop recording" button. CooSpace will ask you to save this recording or not. If you are not satisfied with the recording then press "Cancel" and start recording from the beginning.