GitHub is a web-based code repository that includes collaboration, code review, and code management tools.
What you need to know about GitHub
If your personal information has been exposed on GitHub, either you posted it yourself, or another user posted it. In the former case, simply log into your GitHub account and edit/delete the information you inadvertently posted. If the latter, you have two options: 1) message the user who posted your personal information and ask that it be removed, or, if this is an abusive act by another user, 2) contact GitHub and report the user abusing the platform.