Hit the play button in the bar next to the chapter name.  If you dont see it yet, then wait just a bit for it to download.  If you have access to the internet when you hit play, you should begin to hear it playing.  Make sure your volume is up!  It uses the program QuickTime, which you may have to download.  You can also do this on your mobile phone.  If you use the computer you can just sit back and listen, or right click on the bar and save to your computer for later enjoyment.  If your browser does not support QuickTime, listen on your IPad or IPhone