Go to My Apple ID.
Click "Manage your Apple ID" and sign in.
If you have two-step verification turned on, you'll be asked to send a verification code to the trusted device associated with your Apple ID. If you're unable to receive messages at your trusted device, follow the guidelines for what to do if you can't sign in with two-step verification.
Click "Password and Security". You might be asked to answer your security questions.
In the "Choose a new password" section, click "Change Password".
Enter your old password, then enter a new password and confirm the new password.
Click "Change password" when done.
Sign in with your new Apple ID password to access Apple features and services.