Usually you just plug the player into the comp and a folder will open up and you drag the songs fom their folder on your computer to the mp3 player folder. You need to find the actual folder the songs are in. You can do this by finding them in Limewire Library and selecting explore, if you need to.
A word of warning DO NOT DELETE songs from the library for any reason unless you want to remove them from your computer for good!!!!
I hope this helps. If not read the payers manual, and if all else fails let us know the make and model of the player. If it is an iPod none of the above will work