Try commenting out lines 135-152 in Touch_MP3.ino (https://github.com/BareConductive/touch-mp3/blob/public/Touch_MP3/Touch_MP3.ino#L135-L152) - i.e. putting a // at the beginning of the line. You can also do this by selecting the lines in the Arduino IDE and pressing Ctrl+/ (or Cmd+/ on a Mac).
If you haven't yet set up Arduino with your Touch Board so that you can upload your own code to it, check out our tutorial here - http://www.bareconductive.com/make/setting-up-arduino-with-your-touch-board/
All the best