1. Open Apple's official "My Apple ID" webpage on the computer, then enter your account number and password, and click "Login". (If the ID is changed, please log in with your "@icloud.com" email instead. )
2. After logging in successfully, click Next in the lower right corner.
3. Select the person you want to verify by email or by answering security tips. Select an email here, and then click Next.
4.Apple will send you a password reset email.
5. Go to your registered email address and click "Reset your Apple ID password" in the email.
6. Enter the new password you want to change twice after opening the webpage, and finally click "Reset Password" to complete the new password setting. (Don't use the same password on multiple websites)
7. After the new password is set successfully, Apple will send you an email to inform you that the password has been reset successfully.
8. The passwords of App Store and iCloud photo streaming on 8.iPhone and iPad will also pop up, asking you to re-enter your password.