In Program mode, the only decisions that the
camera makes are shutter speed and aperture.
Everything else--Autofocus mode, Drive mode,
Flash, White Balance, ISO, and more--can be
changed by you.
What's more, through flexible program and
exposure compensation, you can alter the camera's
initial shutter speed and aperture choices,
which means that you have a good amount of
manual override without ever leaving Program
mode.
Program mode is probably where you'll spend
the bulk of your time shooting.
If your D800 is in Program mode, then you'll
see a P right here; if it's not, then you
need to get it into Program mode.
If you did the reset earlier, it should have
switched to Program mode, so you might try
doing the reset again to be sure that that
took.
You could also simply press the Mode button
and rotate your main command dial until you
get the P for Program mode.
