I show you,

1. Using your internet browser, go to http://192.168.100.1
2. Use the word admin for user name and password
3. Click the Forward Rules tab
4. You should be at the DMZ Configuration option
5. Click New, on the right side, add the IP of your computer or game device
6. Check Enable DMZ
7. Apply
8. Try, if not working restart all devices and try again