Firewall/NAT

I want to manage m0n0wall from my internal network (172.18.0.0)

What must i do to get access to the webGUI from the DMZ.

is this possible and when yes
what are the correct rules / NAT rules??

WAN has fixed publicIP
LAN has 192.168.1.0/24 ---> guest Network
DMZ has 172.18.0.0/16 ---> my internal Network

Thanks..