Synchronize DAQ Analog Input & Digital Output (NI USB-6361)

I would like to synchronize a continuous digital output with an analog input on a NI USB-6361 DAQ. I want to press a button and have the digital output send a square wave at 47 Hz and have the analog input begin sampling at the same rate. I have referenced the following link http://digital.ni.com/public.nsf/allkb/EBD603683446EC13862575B3006A63A2, but I am still unsure how to implement this with a NI-DAQmx express VI.

I have attached a working copy of my VI.

Thank you,

Mackenzie