If you want to delete songs from your iPod Touch, you need to hook it up to a computer and have iTunes. There you can look for the songs you want to delete and remove them from your iPod Touch. You can visit this website for more information. http://www.ehow.com/how_2086132_delete-music-from-ipod.html
You can delete songs on your iPod by selecting Devices, then Summary, then Manually Manage Music and Videos. You will then be able to select which songs and videos you would like to keep on it, and remove the ones you don't.