On Windows machines, the "MAC address" is called "Physical Address."
Please follow the instructions below to find the physical address of your network card.
You will see a lot of text similar to the picture below. Please find the section called "Ethernet adapter Local Area Connection" and look for the line that says "Physical Address." Physical address should look something like the highlighted portion of the picture below. If you see several "Local Area Connections," the first one will likely be the one you need.
On Macintosh machines, the "Mac Address" is called "Ethernet ID."
Please follow the instructions below to find the Ethernet ID of your network card.