You can change your email password using the webmail system
1.) Point your web browser to: https://login.secureserver.net
Log in with your email address and current password.
2.) Click on Email->Settings->Personal Settings
3.) Complete the fields on the "Security" tab
Make sure to enter a new password that is strong and not easily hacked. Refer to this article for more information: Setting A Good Strong Password
4.) Click OK
5.) Done