I’m afraid that you can’t, the VM Hub is a fairly crude domestic device, it just doesn’t have any ability to add routing information.
However, I’m afraid to say that what thy have told you is complete rubbish and meaningless. Routing information is a way of telling a device that “if I want to send traffic to this address (or range of addresses), this is where you need to send it first. This has nothing whatsoever to do with your problem.
Can I take it that you have a domestic VM internet connection with a credit/debit card machine connected to it? The card operators get a bit funny if you don’t have the machine connected to a completely isolated network - in theory another device (a PC or laptop) connected to the same network could intercept the data, decode it and gain unauthorised access to the card details. Banks are sensitive to this and often can kick off.
