AI Help

So I’m working on understanding the blueprint AI, and ironically enough that I understand, but I’m fairly new to blueprints, and I could use some help on one of the tutorials, namely https://docs.unrealengine.com/latest/INT/Engine/AI/BehaviorTrees/QuickStart/11/index.html.

I don’t understand how to make the AI_Con_Ref, or the DesiredObjectsType array, Any help would be appreciated!