Sam is right as far as settings go, to see the slope of the green before hitting an approach shot. You would have to click on the cam link on the bottom corner to bring up the overview and then click on the aiming cursor (arrow) and the dots and lines should appear.
If you are talking about when you are on the green, you should have a link on bottom corner that allows you to switch to "Green View" this will bring up a view of the green that will allow you 360 and up/down movements to see the green from every angle. When done, hitting the esc key brings you back to the normal screen (I hate the "Green View" - confuses the crap out of me).