This is pretty self-explanatory. However, this page will walk you through the process very easily, yet securely.
Change Username or Password
Under the My Accounts tab choose the Info Center and you have the option to change your username and password anytime. This option makes keeping your information on the internet safe, easy.
Click on the change password button or the change your username button. Both of these buttons will bring you to a page that will layout the requirements for the Username or Password.
These requirements make the Username and Password as secure as possible. Updating your Username and Password often is best.