If you have more than two interfaces listed for Ethernet and are unsure which is the correct one, look for the entry that has the Link Status set to Active (excluding the 'WiFi' interface.
My battery was not charging when the power adapter is plugged in, it runs fine off of AC power. This is the address that will need to be registered for housing network connections. After following these steps correctly, your Macs SMC. The Hardware Address listed is the MAC address of your adapter.
Under the Info tab, select the applicable network interface from the dropdown menu. Begin typing Network Utility until it auto-completes, then press Enter or click on the application name to open it.
In your Mac's menu bar, click on the magnifying glass icon to open a Spotlight search. With an Ethernet cable plugged into your data jack, connect your Ethernet adapter to the other end of the cable, then plug the Ethernet adapter into one of the laptop's USB or Thunderbolt ports, depending on which type of adapter you are using.
