When you create a new organization from scratch, it doesn't have any repositories associated with it. For more information on adding repositories to your organization, see "Creating a new repository" and "Transferring a repository."
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In the upper-right corner of any page, click your profile photo, then click Settings.  
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In the "Access" section of the sidebar, click Organizations. 
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Next to the "Organizations" header, click New organization. 
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Follow the prompts to create your organization.