Only members with owner privileges for an organization or admin privileges for a repository can add outside collaborators to a repository, unless an organization owner has restricted the ability to invite collaborators. For more information, see "Setting permissions for adding outside collaborators."
When you add an outside collaborator to a repository, you'll also need to add them to any forks of the repository you'd like them to access.
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On GitHub AE, navigate to the main page of the repository.
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Under your repository name, click Settings.
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In the left sidebar, click Collaborators & teams.
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Under "Collaborators", type the name of the person you'd like to give access to the repository, then click Add collaborator.
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Next to the new collaborator's name, choose the appropriate permission level: Write, Read, or Admin.