Open Settings on your iPhone, iPad, or iPod touch
Tap your name
Tap Sign-In & Security
Tap Change Password
Enter your device passcode if prompted
Enter your new password
Confirm your new password
Tap Change
On a Mac, choose Apple menu
Select System Settings
Click your name
Click Sign-In & Security
Click Change Password
Enter your Mac password if prompted
Enter your new password
Confirm your new password
Click Change
On the web, go to account.apple.com
Sign in with your Apple ID
Open Sign-In and Security
Select Password
Enter your current password
Enter your new password
Confirm your new password
Save the changes