Whether you are changing your password after receiving a new temporary password or just looking for a charge, you can manage your password under Settings.
To access Settings, swipe right from the home screen or select the three white bars on the top left corner. Next select Settings, and Change Password. When entering your password, please make it has at least eight characters, one capital letter, one lower case letter, one number, and one of the following symbols !@$%*?
Here is a quick video to guide you.