Here I have explained how to reset and change password on facebook. Follow the below steps.
1.Enter http://www.facebook.com in the web browser.
2.Log In into facebook
3.Click downward arrow at right of facebook page
5.Click “Security and login” on the left side
6. Click “Edit” on the change password under the login.
7.Now enter the current password, new password, retype new password and click save changes.
8.Now your password has changed successfully.