Note: The nRF24L01+ modules is installed in a low profile socket but has normal height pins, to make it sit firmly and lower in its socket remove about 1/3 from each pin with a pair of wire cutters/angle clippers.
Examples can be found once you install the DigiX add ons at: Examples→RF24→
A great introduction to these modules: http://arduino-info.wikispaces.com/Nrf24L01-2.4GHz-HowTo
Recommended library (included in the DigiX addon files): https://github.com/maniacbug/RF24 Tutorial on that library: http://arduino-info.wikispaces.com/nRF24L01-RF24-Examples
CSN uses pin 52 - CE is on Pin 53
Pin 51 can be connected to IRQ via the solder jumper on the bottom of the board.
The add-on files include the RF24 library and examples modified to work with the DigiX
If you use your own copy of the RF24 library the following line: RF24 radio(9,10); Should be changed to: RF24 radio(53,52);
A mesh network layer for the same library can be found here: https://github.com/maniacbug/RF24Network (Tutorials on this need to be added!)