JFidanza: Randy5900: How do you pull the pin?
a little icon in the corner that looks like a flag stick, click on that to toggle in/out
... and be sure to do it before the shot, because the outcome is calculated in the moment you click on the meter, so everything else is considered "after the ball stopped". This is why those players can put it back in while the ball flies - it's only virtually virtual ;)
And, BTW, we see no difference between flag in / flag out on replays. It's always shown there.