How to use N66U as a DHCP relay?

I was trying to take a look at the config files on github, but I didn't see any way to use DHCP/Bind as a relay for a isc-dhcp-server/bind9 setup.

Though, I realized that there might be a bit of trouble with my guest network.

My configuraton setup has a main SSID, and a Guest SSID. However, I have a server that I planned on using for Bind9 and isc-dhcp-server, and is already setup. I would like if all clients could be directed to the the server, rather than using the dhcp server and dns...

How to use N66U as a DHCP relay?