Your server password is different from your Slamdot account password. You will have a server password for each of your hosting plans. Your server password is for your primary email and FTP accounts, as well as your primary database and FrontPage access, whereas your Slamdot account password, along with your email address, is used to login and manage all of your hosting plans.
To change your server password, from your Dashboard click “Account”. Go to “Password” under the Access section. Enter your new password and click “Change Password”.