In this tutorial, we cover how to use Events and Functions in Fortnite Creative. If these features are not currently available on your island you can toggle them on by opening the My Island menu and Convert your Island to use the Event System. See below for screenshots of how to enable the Event System.
https://dev.epicgames.com/community/learning/tutorials/rPMp/unreal-engine-how-to-use-events-and-functions-in-fortnite-creative