If you are using an integrated ethernet card with MiamiDx go to Hardware -> Eth -> SANA-II paramaters -> Hardware address. But any other TCP/IP stack should be able to display MAC of ethernet card (it's also called hardware address, like in MiamiDx).
BTW. I also send an email with information and got no reply. But when I was asking about some details of upgrade early this month I got reply in about 10 mins
.