Changing the password for your service is very easy, and can be done directly on the billing panel (what you're using right now.)

Follow these steps:

1. Click "Services" on the navigation menu above.
2. Click"My Services"
3. Click on the service you would like to select.
4. Under the "Server Information" page click the pencil icon next to the "Root Password" column on the "Server Details" box.

Please remember, this changes the password to your service. This password is different than your billing panel password or your control panel password.