Watchguard soho6 & Airlink SuperG Wireless Router

I have an Airlink SuperG Wireless Router that I am trying to setup behind my Watchguard soho6 firewall appliance. I cannot get the superg or the watchguard to recognize each other. What do I need to do to get the SuperG to pass internet traffic through the Watchguard and vice-a-versa?

Thanks in Advance