DVR CONFIGURATION IN THOMSON TG585 V7 ROUTER

HI
I HAVE ONE ANALOG CAMERA CONNECTED TO DVR AT OUR BRANCH.AND I CREATED ACCOUNT IN DYNDNS.ORG .HOW CAN I CONFIGURE DMZ IN THOMSON TG585 V7 ROUTER. BECAUSE IN RPUTER NO OPTION FOR DMZ .MY DVR IP IS 192.168.1.111

PLEASE HELP ME