Not routing traffic (New setup)

I am pretty sure I am just missing something somewhere. I am setting up a UTM220 for the first time. I setup the WAN connection for our Internet provider. It shows as UP in the dashboard. I can do a ping test from the UTM device and I'm getting responses. However, I cannot get it to route traffic from the LAN onto the Internet. I point my PC's default gateway to the UTM but I cannot ping out to the Internet. What am I missing?

Thanks
Kent