Trouble with Dialoguer Add-On

I'm having trouble setting up the Dialoguer add-on. At 7:20 into the tutorial video below, a button shows up on screen after some initialization script is written. Problem is that I'm not getting that button on screen. I've followed the tutorial exactly, so I'm not sure what's going wrong. Any clue why it might not be working for me?

I'm a bit of a noob with Unity, so I apologize if this ends up being a stupidly simple problem.

By the way, I'm using the free version of Unity. I don't know if that makes a difference, but I know the addon is supposed to work with it was well as Pro.

 

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