Why does my oscilloscope get no pulse wave when connected to my DAQ board?
I would start by disconnecting the square wave generator and replicating exactly what was done in the video. If you can make the sine wave appear, at least you know the rest of the VI is working.

You can also wrap the whole VI in a while loop and let it execute perpetually while you're fiddling with the DAQ view, instead of pressing play over and over again.