No input in my blueprint

Development Programming & Scripting Blueprint
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1

I added blocks such as “F12”, “Mouse Wheel Up”, “Mouse Wheel Axis” , and connected them to PrintString
Nothing worked.

There was block “Tick” and it works with “PrintString”.

my blueprint is a Blueprint Class, its parent class is a Static Mesh Actor.
What should I do?

2

I found answer here
https://docs.unrealengine.com/latest/INT/Gameplay/HowTo/ActorInput/Blueprints/index.html