By the default, the buttons at the bottom of the iPod screen are “Playlists”, “Artists”, “Songs”, “Videos”, and “More”.
You can however change them. Go into the iPod application and by press the “More” button, and then tap on the “Edit” button in the upper left corner.
A Configure screen will appear showing all the available icons, “Albums”, “Artists”, “Songs”, “Videos”, “Audiobooks”, “Compilations”, “Composers”, “Genres”, “Playlists” and “Podcasts”.
To substitute one of these icons for one that appears at the bottom of the iPod screen, just tap and hold onto the icon you prefer and drag it over the icon you want to replace. Tap on “Done” when you’re finished.
The buttons on the bar at the bottom of the iPod screen will now permanently show your new choices, until you change them again.