Please log in here: https://portal.voice.isx.nz/ (If you have forgotten your password, then click here: Resetting Your Voyager Voice User Portal Password)
If the User Portal has not loaded for you by default then click on the Apps icon to the top right
Click on the Control Panel icon to load the application
Also, if you wish to set the Control Panel application as the default application to load when you log into your account, then simply drag and top the icon here: