Click in the top right corner of any Facebook page and select Settings.
Click Security and Login.
Click Edit next to Change Password.
Click Save Changes.
If you’re logged in but have forgotten your password, follow the steps under Change Your Password then click Forgot your password? and follow the steps to reset it. Keep in mind that you’ll need access to the email associated with your account.
How to Reset Your Password
To reset your password if you’re not logged in to Facebook: