Open the Apple ID account page at https://appleid.apple.com
Sign in with your current Apple ID and password
Select Sign-In and Security
Select Password
Enter your current password
Enter a new password
Confirm the new password
Select Change Password
If you forgot your password, go to https://iforgot.apple.com
Follow the prompts to reset your password
Update the password on your iPhone, iPad, Mac, and other Apple devices if prompted
Sign in again to iTunes, App Store, and Apple services with the new password