Enabling Lightning Experience in a developer org.

I'm studying Admin Trail - Migrating to Lightning Experience modules. I use a developer Org, to practice and to do challenges.
But I don't see how enbaling Lighting Experience. In this module https://developer.salesforce.com/trailhead/lex_admin_migration/lex_migration_introduction/lex_migration_introduction_administration, it's indicated that : "To enable Lightning Experience, go to the Lightning Setup page, which is accessible in Setup by clicking Lightning Experience" but i can't find the Lightning Setup page.
Is Ligntning Experience included in Developer Edition? if Yes, How can i enable it? if No, When it will be included in Developer edition and how can i get it?
Thank your for your help.

September 29, 2015
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Best Answer chosen by Rafik FAREH

Mark SF
Lightning Experience is part of the Winter '16 release. Your org is still on Summer '15.

All orgs should be upgraded to Winter '16 by Oct 18. I suggest trying again then.

September 29, 2015
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Mark SF
Lightning Experience is part of the Winter '16 release. Your org is still on Summer '15.

All orgs should be upgraded to Winter '16 by Oct 18. I suggest trying again then.

This was selected as the best answer

Praveen KHari
All sandboxes are enabled with Lightning Experiance. As Mark mentioned you have to wait for Oct 18 for developer and production orgs for lightning experiance. But you can request for a Lightning enabled org from salesforce (use below link). You can try Lightning expeiance here and provide feed back to salesforce

https://www.salesforce.com/form/signup/lightning-ee-signup.jsp

For more details about lightning experiance use Lightning experiance FAQ site
https://developer.salesforce.com/page/Lightning_Experience_FAQ