Embedding MP3 Audio file
You can upload MP3, MP4, FLV same as attaching files by clicking the 
beside “Add media”.
After upload the audio/video file successfully, click “Insert into post” button.
You shall be able to play the MP3 at your site upon successfully uploading the MP3.
Note : You must, however, have the appropriate plug-in components installed for your PC and browsers, e.g. Flash, Quicktime or Media Player.