How to remove music from sansa m250 that is no longer on computer

ok, plug the mp3 into your computer, click on my computer, then where it says removable devices you should see your mp3 listed, double click it. browse the folders listed until you find the songs that you want to delete , when you find one you want gone RIGHT click it then click delete/ It should then remove the song from your mp3 and put it into your recycling bin.