How to determine the MAC address of My Book

Sorry if this has been asked before, but a search on MAC doesn’t work too well in this case.

How do I determine the MAC address of the router. I want to use DHCP but still assign a specific IP to  MyBook via its MAC address.

Now I feel like an ■■■■■. It is written on the bottom label. In my defense I can only say it is in tiny characters.

Sorry about the tiny characters.