In your player controller
.h file
virtual void SetupInputComponent() override;
void KeyPressed(FKey key);
.cpp
void ACarPlayerController::SetupInputComponent()
{
Super::SetupInputComponent();
InputComponent->BindAction("My Action", EInputEvent::IE_Pressed, this, &YourPlayerController::KeyPressed);
}
void YourPlayerController::KeyPressed(FKey key)
{
// do the magic
}