How to load onto the SD card?

Hi I have a newish clip sport and also put in a 16 gig SD card.  I use a macbook and itunes to load songs/podcasts, but am having trouble knowing how to put songs onto the SD card.  (i.e., there is no SD card icon in “finder” view on my computer, and everything I load seems to go to the clip sport’s own memory).   I sort of expected there to be an additional icon that I could drag stuff to/from.

As an aside, whenever I plug in my player, my computer shows 2 devices as plugged in:  “untitled” and “no name”.  Could this be related?