After you change the router IP address to 192.168.1.1, your PC or laptop will temporarily loose connection with the router.  As long as the PC/Lap are set for DHCP, you should be able to disconnect, then reconnect to the router.  If you are wired, try unplugging the ethernet cable, then reconnecting.  If you are wireless, try disconnecting the connection, then reconnect.

After you get connected again with your router, try typing the IP address of the Cube into your browser: 192.168.1.254:8000

Hopefully you can configure the cube with a new IP address (ideally use the other Cube's IP address plus one, 192.168.10.201 if your other cube is 192.168.19.200, for example). Also set your pool address, port #, username, pass, etc.

After all of the cube setting are correct, go back into your router setup page (it has changed to the new IP address that you temporarily set, 192.168.1.1).  Now change the router IP address back to the old 192.168.10.1.  Reconnect your PC/laptop to the router and then you should see the second cube on the network.