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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在 GitHub 上,导航到存储库的主页面。
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在仓库名称下,单击 “Settings”****。 如果看不到“设置”选项卡,请选择“”下拉菜单,然后单击“设置”。

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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