How to Change Your Password on Your iPod Touch
Your iPod Touch allows you to create a passcode to prevent unauthorized access to the device. This is a useful feature, especially since the device can store sensitive data including private emails and pictures. If you gave someone your passcode to temporarily access the iPod, you should change the passcode when he is finished using it to ensure it stays protected. To change the passcode, use the passcode lock utility in the iPod touch.
Turn on your iPod Touch, and enter the current passcode to access the device.
Locate the "Settings" icon. It is usually located on the first page of the home screen. If it is not on the first page, scroll through the other pages until you find it.
Tap the "Settings" icon, and then tap "General."
Tap "Password Lock," and then enter your current passcode.
Tap "Change Passcode," and then enter your current passcode again.
Enter your new passcode, and then re-enter it to complete the process. The password on your iPod Touch is now changed.