Mac Forums

I was on YouTube and decided to download this song that's a remix and it gave the legal download link and youtube said it was ok, so I converted the song to mp3. The only problem is, after I opened it in itunes, and tried to change the info, it didn't work. Well, it let me play the song, and then I went to change the info, and it was NOT grey-ed out or anything, but after I changed the info of the song since it was like IewJRwE82348782(just an example,not real), it said that it could not be found... how do I fix this? So i can change the song title,ect. and make everything fine? Please help me.(: REMEMBER: song was NOT grey-ed out or any form of grey; it allowed me to change it but then said it was not found... please help... and thank you for the help in advance (=