Often times when working with LTS its necessary to provide a string of numbers/letters called a "MAC address" for your PC or Mac.
|Mac OS X 10.6 - 10.9|
|Windows XP, Vista, 7, 8|
This will provide the "MAC address" (or "Physical Address" as listed here) for all your network devices on your computer.
Do a little bit of scrolling through the report to find the MAC address/Physical Address for either your wired ethernet connection or your wireless connection as pictured below.