Help with RF24Network and nRF24L01+

Hi Simon,
I have loadded your "sensornet_mod" but give me this message:

[]RF24Network/examples/meshping/
VERSION: Unknown
*** No valid address found. Send node address via serial of the form 011N
ERROR: This sketch cannot run on node 00

How do I configure to Node 00?
And I do to configure to Node 013?

Thank you!

AJoao