Inviting a collaborator to a personal repository
You can send an invitation to collaborate in your repository directly to someone on GitHub, or to the person's email address.
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Ask for the username of the person you're inviting as a collaborator. If they don't have a username yet, they can sign up for GitHub. For more information, see Создание учетной записи на GitHub.
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На GitHubперейдите на главную страницу репозитория.
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Под именем репозитория щелкните Settings. Если вкладка "Параметры" не отображается, выберите раскрывающееся меню и нажмите кнопку "Параметры".

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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.
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The user will receive an email inviting them to the repository. Once they accept your invitation, they will have collaborator access to your repository.
 
Next steps
- For reference information, see Permission levels for a personal account repository