I\'m using Visual Studio, and the GitHub Extension. I am able to sign in, then clone my team\'s repository, and then pull changes successfully.
When it comes time to
As per my comment. You can include your username in the remote URL (similar to FTP).
Example without password (SSH):
git remote set-url origin git@github.com/username/repo.git
Example with password (https)
https://name:password@github.com/username/repo.git
Source: Git push requires username and password
Updated 5/14/2018 to correct github.org to github.com in the original answer