Select menu on the left. Select extra from the list of icons that appears. Select composer from the list of icons that appears.

Press 1 if you want to enter Do. Press 2 if you want to enter Re. Press 3 if you want to enter Mi. Press 4 if you want to enter Fa. Press 5 if you want to enter Sol. Press 6 if you want to enter La. Press 7 if you want to enter Si. Press 0 to enter a musical space.

Put the cursor immediately after the tone whose octave you want to change. Press the asterisk * key once, to change the octave for the current tone.

Select the tone. Press the bottom-right sharp key.

Select the tone or musical space. Press 8 once, to decrease the duration, or press 9 once to increase the duration.