Peter, that RJ45 port is actually another Ethernet port for plugging in a cable or ADSL modem. You cannot use the USB wireless modem with the Netgear. The closest you can get is setting up a PC for sharing your USB wireless Internet. You can either run the PC itself as hotspot, or plug it into said port on the Netgear. You will then need to configure the OS to forward traffic between the USB and WiFi or Ethernet interfaces.
Cheers
Steffen.
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