|I had to look that device up. I've never used a USB modem.|
Unless your router has a USB port that can be configured as a WAN port, you can't use it the way you would with a regular modem.
I suspect you would have to enable ICS on that USB modem, if you can. Then once that's done, plug your computer into the router with a network cable and then configure the router's LAN side with an IP address in the same subnet as the computer. Then you could create and enable a WLAN on the router.
If memory serves me, and it's been ages since I touched ICS, it assigns your wired network interface the following IP: 192.168.0.1 with subnet mask: 255.255.255.0
So, you would need to use something like the following on the LAN side of your router:
Default Gateway: 192.168.0.1
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.