Ok. First, go to this place with internet explorer.
192.168.1.1
Then, put in your account and password. Don't have an account and password setup for the computer? No problem. Put something random like Poodle, and it will set the password to admin automatically. Now, you shoudld be in the Router's properties. Next step is to click advanced. Now there will be more things to click. Click "DMZ Host"
and enter the last part of your IP in the box. Hit accept and your clear!!!!!!!!!!!!!!!!!! One thing, however. Only one computer on your LAN network at a time can be DMZ host. So alternate when you need to. Hope your happy!!!