Gnutella Forums - a diffeent ITunes and LW problem... not so easy!

hi fellas!
i now that u guys have been talking quite a bit bout limewire + iTunes but i have a different problem i think...
ok both programs work just fine but on Itunes when i want to change the artist or the album name of a song, itunes doesnt allowed me. in fact when i right click the song that i wan to modify and than go to get info, on some songs the name of the song, the artist, and everything else appears gray and "unclickable"... i thought that the problem coul have been caused by the newest version of tunes recently downloaded so i insalled the old version iTunes 7.5 but nothing changed...
help me out guy this s**t is driving me nut!
i dont know if it matters but to add the music to the Itunes library i just set ituns as defult program to open .mp3 files and than click on all thew files i want in my library...
thk for the help guys!