User Event
User Event is the way to NetworkEventsManager allows the user to listen when some custom event arrives.
Select the event that you wish to listen to and click on "Register event to listen".
The selected event will be registered.
Now you need to select the action to take when this event arrives.
You can find a full example of how to implement custom events on "16 - Custom Events" scene. In this scene, you will find scripts and objects to clarify how to implement your own custom events.