You need to be a registered member in order to download audio.
Registration is Free.
Once you are registered, you will see a "Download Audio" button appear at the bottom of each audio file.
Simply click the "Download Audio" button, and the MP3 will begin to download.
If you do not see the button to download audio, then you still need to register.
There are two links to register at the top right of the website, as well as a link in the left hand column.
You do not need to be registered to play the audio. Everyone can play the audio.