Changing Exim "Listening Port"

[RTCruiser]

I have a spam filter that requires I change the MTA listening port. I know the setting to add to exim.conf is "listening_port=127.0.0.1new port number), but I wondering where I enter this in WHM using the "Exim Configuration Editor" in the advanced mode. IOW, does it go in the ACLs, the REWRITE CONFIGURATION, the ROUTERS CONFIGURATION, the DIRECTORS CONFIGURATION, or the TRANSPORTS CONFIGURATION? Or none of the above?

Any help would be appreciated. Thanks!

[hari_anj]

WHM > Service Manager > exim on another port > check and specify another port.