Connect your camera to your computer the same way as you would for transfer of images thru USB cable,
and double click on the My Computer icon.
There you should see a Removeable Disk/Drive icon.  
Double click on the Removeable Drive/Disk and you will see the contents of your MultiMedia card.  
Create a new folder on your MultiMedia Card named "DCSD".
Open the new, "DCSD" folder by double click and create a new folder named "100jvcgr" there.
Copy MP3 sound files to the "100jvcgr" folder.
Card is read for use in the camera.