How can we import MP3s to a Samsung MP3 player?

A friend of mine bought a super cheap (years old) Samsung MP3 player today, but is having problems getting songs onto it. Apparently she has been downloading .MP3 files from music sites and whatnot, and those are the songs she is trying to get on the device. I’m miles away from her, and so I can’t just drop by and take a look for her, so if you guys could help, it’d be wonderful! She is using a PC that has Windows XP on it, if that helps at all.