Click Sign In, and a pop-up will open informing you Visual Studio Code wants to sign in using GitHub. Click Allow, and your default browser will open.

Gamma hit the "open-source button" for VS Code's GitHub repository on stage at a Microsoft conference in 2015 as part of his demonstration of the editor's broad extension support.

For those interested in exploring the capabilities of GitHub Copilot Free, the service can be enabled directly in VS Code or accessed via the GitHub dashboard.

Microsoft has released the source code for the GitHub Copilot Chat extension for VS Code under the MIT license.