In Steps:
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* Open Command Prompt by typing cmd in Run.
* Now type ipconfig in Command Prompt.
* Look for "Wireless LAN adapter Wireless Network Connection: Now look for IPv4 Address: (your ip)
* Make sure to write or type your IPv4 Address down somewhere where you can find it.
* Now go to http://www.minecraft.net/download and download Minecraft_Server.exe
* Make a new folder where you can find it and place the Minecraft_Server.exe inside of it.
* Run the server.
* Once it says [INFO] Done (_____)! For help, type "help" or "?", type in the bar under the scrollbars: "stop" and press enter.
* Log into Minecraft, click Multiplayer and then click "Add Server". Type in your IPv4 Address as Server Address and anything as the Server Name.
* Run the Server.
* Make sure the person you are playing with is on the same internet connection and has a Minecraft server with the same IP as the Address.
* That is all if it works but if it does not work then continue reading.
* If the server does not allow the other player in, then try going into server.properties in the server folder (where you placed Minecraft_Server.exe) and change online mode from true to false
* If the other player cannot join and the server is running, the online mode=false and they have the IPv4 as the Server Address, then your computers/ laptops Firewall has blocked any other IP Address from coming into your computers IP to share. You can disable the Firewall completely or watch some other video from YouTube to only let Minecraft through your Firewall/ IP Address.
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Thanks for Reading! All credit goes to ME! Well and Minecraft for providing the server but.... never mind that!
The website for the server runner is here: http://www.minecraft.net/download