The process for finding the Media Access Control address of a computer differs depending on if one is using a Windows or Apple computer. On a Windows computer, it can be found by entering "ipconfig /all" into the command prompt. On an Apple computer, utilize the system settings (or preferences menu) to access the advanced settings information for the selected network.
For Windows computers, open up a command prompt by typing "cmd" (without the quotes) into the start menu search box. At the prompt, type in "ipconfig /all", and press enter. There must be a space between "ipconfig" and "/all" for this to prompt correctly. The MAC address appears under the Ethernet adapter heading in a field labeled "physical address".
For Apple computers, open the Apple menu and click "system preferences". Click the network icon, and then choose Ethernet or AirPort, depending on how you connect to the Internet. Click "advanced", then click the Ethernet or AirPort tab. The MAC address is shown in the Ethernet or AirPort ID field.