How do I set a static IP address for a device attached to the Router?

Very easy – the addresses from 10.0.0.10 to 10.0.0.49 are reserved for static addresses. The addresses from 10.0.0.1 to 10.0.0.9 are reserved for Ayrstone devices, and the addresses from 10.0.0.50 to 10.0.0.254 are used by the Router’s DHCP server.

So simply assign an address between 10.0.0.10.and 10.0.0.49. Remember to write down the address, because it won't show up in the Router's DHCP table or on AyrMesh.com.