I got the grass essentials pack, and following the tutorial, but every time I put the grass in as the tutorial shows, it is a grey color and does not change. I also cannot change the density, it seems like there is very little grass there that is all grey. am I missing some button or something from the tutorial?
If you look at the very top of the screen for the tutorial in question, you'll see that is made with blender cycles and you are trying to do it in blender internal. Change it here: