How to cast from widget to blueprint?

I have a UI widget elevatorButton6.

When player press the button on this widget, I want to launch a bluerint bp_elevatorButton6, but I can’t cast to it.

What should I put to object?

This Stop Plane function is inside my pawn blueprint.
You want Cast To aka (send data to… thirdpersoncharacter, flyingpawn,bp_boss_monster) etc.
Object is basicly “What should get this information”.