On the bottom of the Fusion HD there are two numbers... one is the MAC address and one is the Serial Number. The MAC Address is the "bolder darker" number. If you are unsure which one is the MAC address go to set-up, version, then you will see the LAN MAC address - then that would indicate that the OTHER number is the Serial Number.
You can register your Fusion HD on our Web Site - regardless if someone purchased it for you as a gift and regardless what country you are in. The registration will ask you related questions that only the original purchaser has knowledge of. We provide RMA and Warranty service to all our customers all over the world as long as you purchased the Fusion HD from an "Authorized Re-Seller" - the Fusion HD is very popular to international customers.
To Register go to our Main Web site - www.nixeus.com
then click on the support tab then click on product registration. If you don't have a login account you can create a new one.
Hope this helps...