do u have any other software? there are some where they ask if u want to erase the info on the cd.... u may need to play around with it a lil bit and see whats what.... if that made any sense lol
If you are talking about a CD-R you can't delete music from it after it has been burned.
However, you can buy CD-RW's which are rewritable but are considerably more expensive and can be uncompatible with some players.
CD-R's are so cheap now (50-100 for �10ish) that it's probably just as economical to burn your music to these and keep for future use rather than continually rewriting them.