Should you need to change your password for your online account there are two methods.
First if you do not have access currently, you can click the "Forgot Password" link on the log in page to reach the page below. Put your email address in and click "Send Email" to get a link that will let you set a new password.
Second, if you currently have access to your account. You can log in and in the upper right corner, click on your name: