How to call MainMenu Widget BP?

Development Programming & Scripting UI
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1

https://docs.unrealengine.com/latest/images/Engine/UMG/UserGuide/CreatingWidgets/CreateWidgetNode.jpg

Uhm… how to call MainMenu Class from Level Blueprint to get the Set MainMenu?
Any help here. I am still new about UMG.
I am using 4.6.

2

I meant from this tutorial:
link Creating Widget

3

I already know the answer: by reading this tutorial:
https://docs.unrealengine.com/latest/INT/Engine/Blueprints/UserGuide/BlueprintComms/index.html#creatinganobjectvariableforthetargetblueprint