Downloads. my grandaughter was given a mp3 player. we are trying to download songs. I plug it up

Question

my grandaughter was given a mp3 player. we are trying to download songs. I plug it up to the usb port and the light comes on. It does not show up a new hardware. On the side is FC youtopia model no. 68608 The front says Bath &body works. How can I get my computer running win XP to recognize this player and to download itwhen i try to download songs it says media is write protected. What does that mean?