Use the extra row in LANDSCAPE mode by pressing the "2" in the middle of the screen (the double-row button).
Or simply turn your iPad and it will switch into PORTRAIT mode which includes the extra row. You choose which method works best for you.
Of course PianoPad still can be used the 'normal' way which included the sheet music and avatar in landscape mode. Just don't press the "2" or turn your iPad if you don't need the extra octaves.
Currently this is only available for PianoPad users who download the 1.2 update.