In order to delete the unwanted songs from your device, you must launch the Motorola Digital Music Center - it should have come with the installation CD, but is also available on Motorola's website at:
under Motorola Music Manager
When the M25 is conected to the computer and the music manager is launched, you can view a list of all songs on the device by clicking on the icon of the M25 in the left-hand side of the window. You can highlight the songs you don't want by left-clicking the song and pressing delete on your keyboard. There will be a prompt warnign you that this will delete the selected songs permanently from the device.
-Tha Mp3 Doctor