The next step, trying to make it work for the rest of your network.
You do not need to change any settings. Just move the Untangle up one level on your network.
Example: Let say your network looks like this:
WAN-Router-Switch-Untangle
One level up would be
WAN-Router-Untangle-Switch
meaning plug the external interface to the router side, and the internal interface to the switch. Since it is in the bridge mode, you should be ok with the IP address and configuration. Big thing is to make sure to check that your interfaces are not flipped.