The 2014s console looks a bit different but the concept is the same. There should be a section in the owners manual covering off road capability where the N button is described with these kinds of words:
NEUTRAL Shift Procedure
Turn the ignition switch to the ON/RUN position, engine off. Vehicle stopped, with foot on brake.
Place the transmission into NEUTRAL.
Press and hold the NEUTRAL button located near the 4WD mode control knob with a pen or similar object for four seconds. The indicator light will begin to flash indicating the shift is in progress. The light will stop blinking (stay on solid) when the NEUTRAL shift is complete. A “4WD SYSTEM IN NEUTRAL” message will display on the Electronic Vehicle Information Center (EVIC).
Repeat these Steps to shift out of NEUTRAL.
2011 Grand Cherokee Overland V8, 2009 Liberty Rocky Mt V6, 2000 Grand Cherokee Laredo I6, 1979 CJ7 I6 Quadratrac