same place as the movies
You click on the Video's App.
Yes, most.
Downgrading your iPod Touch should not delete anything.
You cannot delete the legal information in the settings on your iPod Touch.
restore your ipod touch on itunes
It will delete music from iPod Touch, but the regular iPod i don't know about.
I have an iPod touch and when I delete applications the memory that it uses comes back. I used my iPod touch to type this.
veiw it and press delete
delete it from your library in itunes
First, you need to connect the iPod to iTunes. Then, click on the Music library that is under the iPod Touch menu. That is your iPod Touch's music, and just right mouse click to delete them.
unfortunatly there is no way to delete songs from the iPod touch itself to delete songs you need to do it through iTunes.