How do I activate reboot rally Fortnite?

Excuse me, could you possibly explain to me the steps involved in activating the Reboot Rally event in Fortnite? I've been trying to participate but I'm a bit unsure of how to go about it. Is there a specific menu or option I need to select in-game? Any help you can provide would be greatly appreciated. I'm eager to take part in this exciting event and want to make sure I don't miss out on any of the fun.