Hi. You need to connect the F Key Event’s Pressed or Release pin to the execution pin of the Start Camera Shake node.
The execution flow of a blueprint graph in Unreal will appear as a white line connecting certain nodes together. The shape and color of the inputs and outputs of nodes (often referred to as ‘pins’) reflect their type. In this case, the Pressed and Released pins have the same arrow 
shape as the top-left pin in the Start Camera Shake node.
You can hover your mouse over a pin to get a tooltip that will include the name of the pin, followed by the type of the pin. If you hover over the Pressed pin, you’ll see a tooltip that says [Pressed Exec], meaning it’s an execution-type pin. If you hover over the Scale pin, the tooltip will show that it’s a float type.
Here’s some documentation on Blueprints for additional information: https://dev.epicgames.com/documentation/en\-us/unreal\-engine/blueprints\-visual\-scripting\-in\-unreal\-engine
I hope that helps![Image Removed]