Here is the procedure to set an IP to DMZ......
logon to the WEB ADMINISTRATION, and choose NAT
http://img204.imageshack.us/my.php?image=1othersettingsky1.png
then CLICK on PORT MAPPING SET
http://img204.imageshack.us/my.php?image=2natht8.png
logon to the WEB ADMINISTRATION, and choose NAT
http://img204.imageshack.us/my.php?image=1othersettingsky1.png
then CLICK on PORT MAPPING SET
http://img204.imageshack.us/my.php?image=2natht8.png