What makes you think that you can remotely manage the Hitron? The reason that the Hitron manual doesn't provide details is that thje protocols used enable VMB to manage the Hitron and indeed to some extend devices on your LAN.
but its what you need to do. if you are running a business ask your IT staff for help. Having a router open to the internet with no real security is bad. password attack against it will not lock it out after a number of wrong passwords. It wont take long to break in and then your in touble.