Portforwarding
1. Go to the start menu, click the run button, once there type in "cmd" after that you will see a command prompt (A black box, with a little bit of text) in there it should have a place to type something, type "ipconfig/all", keep that open for future reference.
2. Open internet explorer and in the adress bar enter "http://192.168.0.1" Note: This may vary from different routers! You may have to use portforward.com! If you have the right type of router for that address you should see a login prompt. Login using the following info: Admin/Nopass, admin/admin or if that doesn't work someone has set a password, or your router uses something else.
3.Once inside the router click the Advanced tab on the top, once clicked it should bring you to the port forwarding place! Now in the correct tabs enter the following information (found below the tutorial) and click "Always" on the schedule, and your finished!
If its a bit confusing you should use portforward.com it lists most of the routers and can really be descriptive.