How to change gateway nic to dhcp

[Al Plant]

Aloha...

FreeBSD 10.0 os.

I have a static gateway that needs to be set to nic interface DHCP on 
the outside. It was set static on both sides when the Lan was originally 
setup. Is there a file name that I can use and just change to DHCP from 
the IP?

I used to do this when sysinstall was the way to go. Do I use 
etc/rc.conf as we used to. or do I have to go into the new BSD Installer?

Thanks

~Al Plant - Honolulu, Hawaii -  Phone:  808-284-2740
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"All that's really worth doing is what we do for others."- Lewis Carrol