Windows vista problem with itunes?

When i download a song from video2mp3. net and put it on my itunes it does not let me change the songs settings, such as name and artist, im using video2mp3 because limewire got shut down. if anyone could help me solve this problem that would be appreciated. (for instance i dont like me songs having the name Wiz Khalifa - Chewy and not having an artist, it doesnt organize well) Thanks!