Instructions
Press the power button below the D-pad to turn on your DSi.
Drag the DSi menu across with the stylus until you see the DSi Sound icon. Tap on it.
Tap on the "Record and edit a sound" option.
Tap one of the empty balloons from the menu to record a new sound, using the stylus.
Tap "Record" to start recording. You can record up to 10 seconds of audio. To stop recording before 10 seconds is through, tap the "Stop" button.
Choose a color for your sound and press "OK."