Adding files to CD-RW's
I made a CD-RW disk with about 100 music files. I was wondering how i can add more files to that disc without having to delete the previous songs and remaking the cd?? Just adding more songs on to a previous CD-RW disk. The music software programs i have are: Nero & Easy CD Creator 5 Platinum. Do i need to download any other special programs or can i use the software i have now??