I don't know how mac works but on windows you just copy/paste from wherever its stored on your pc to the SD Card, make sure to look in the DSi's manual as well as you need to have one of three specific filename extensions otherwise it won't work, the manual will also tell what bitrate and sample rate the music should be at for it to work. In the uk manual you'll find this info on page 47.
Manchester United 2008-09 Season - Trophies & Records







