Render Tutorial

I am stuck on the last part as well. first I'd like to say this is a cool tutorial and I am looking forward to doing this on my C4D. Unfortunately due to the what you put for directions on the second to the last part it has left me in the dark as to what to do next. WilliamFMC, I am a noob but I have been able to catch on pretty quick with this software. Though, when you say, 'Triangle Icon" I don't nor have I seen one on top of my perspective window. I only see four buttons on top of the perspective window and none of them will do anything remotely close to that when I hold down the right click and swipe left or right. Then when I have done that I zoom in and nothing has changed.