Hi Clive,
I'm going from memory here, but the 190 has only one ethernet port, yes?
If this is true, then you cannot do what you want. You need at least two ethernet ports. One to connect your modem to the router and one as a loopback from the router back to the modem. Also, you would need to set both router and modem to be in the same subnet (unless the router allows you to set up more complex routing tables).
An alternative which overcomes this single port number limitation is to try a hub between the modem's single ethernet port and the router. That should work, but I have not tried it TBH.