I cant transfer my music to my mp3 player. santa brought two mp3 player to my sons. santa

Question

santa brought two mp3 player to my sons. santa apparently is not smart enough, he can't figure out how to tranfer their music onto it. helppppp???? i have downloaded the music into the computer and can play it on the computer, just cant tranfer it to mp3. i have windows me.how do i dowload my music to my Delstar MP3 player