Changing settings in Nikon is not reflected in live view.
Nikon does not provide live view simulation of all the different settings. Therefore, the best solution is to change your settings and then take a snap.
Please also make sure you turn off Auto ISO sensitivity:
From - Shooting Menu -> ISO Sensitivity settings.
Change the Auto ISO sensitivity control to OFF.
Note- Normally for low lightings this is set to ON.
Q & A
Q1: Live stimulation doesn't work for all Nikon models
A1: Nikon support live view simulation for some parameters and for different cameras, but these settings are totally different from camera to camera. See this article for example: http://photo.stackexchange.com/questions/41332/nikon-live-view-shutter-speed-preview-a-non-feature-in-the-future
We have tested Shutter Stream with multiple Nikon cameras and for all we can change some parameters in live view simulations but not all.
Q2: ISO sensitivity control is set to OFF already. ISO and Shutter and Aperture didn't allow value changes
A2: Make sure your camera is not set to Manual mode. You need to rotate the wheels mode to Manual.
Q3: Cannot initiate capture command. Error code is 4294967174
A3: The error code means in NikonSDK "kNkMAIDResult_NoMedia". Please remove the SD card from the camera and try again. Or, try inserting the SD card in the camera but make sure the card is empty.