In Fortnite, you type island codes in the Search icon on the main lobby screen. On controller, that’s usually the magnifying glass near the Play tab, and on PC you can click it and enter the code there.

Steps

  1. Open Fortnite and go to the main lobby.
  1. Click or select the Search icon near the Play tab.
  1. Type or paste the island code into the search box.
  1. Press Enter, or the console confirm button, then select the island and Play.

Console note

If you’re on PlayStation or Xbox, you may need to use the on-screen keyboard after opening Search, then confirm with the menu/options button or Enter equivalent.

Tiny example

If someone sends you a 12-digit island code, you put that code into the search field and Fortnite shows the matching island result.

TL;DR: Go to the lobby, open Search , type the island code, then select the island and start it.