Here is the part of the tutorial that I'm following that I'm stuck on:
With your landscape selected, go to the Shading Panel (F5) and add a new material. Under the Shaders tab, drop the Specular value to 0.
It can't be the "shading" panel in the properties window, because I don't see a "specular value". None of the function keys work for me. I'm using Blender 2.77.