Inviting a collaborator to a personal repository
You can send an invitation to collaborate in your repository directly to someone on GitHub..
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Ask for the username of the person you're inviting as a collaborator. 
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En GitHub, navegue hasta la página principal del repositorio. 
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Debajo del nombre del repositorio, haz clic en Settings. Si no puedes ver la pestaña "Configuración", selecciona el menú desplegable y, a continuación, haz clic en Configuración.  
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In the "Access" section of the sidebar, click Collaborators. 
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Click Add people. 
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In the search field, start typing the name of person you want to invite, then click a name in the list of matches. 
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Click Add NAME to REPOSITORY. 
Next steps
- For reference information, see Permission levels for a personal account repository