Fortnite Island code?

Where do I see my island code in creative mode?

To get an island code, you have to do the following:

You have to have your own support a Creator Code.
For this you have to have 1000 subscribers on any social media platform.
The revenue from the Support a Creator Code must be obtained in any form (email, post etc) from Epic Games

Then you can request an island code from Epic Games.