After using BitBucket Mercurial for years, I have decided to move on and host Monstra code on GitHub.com.
Main reason was that GitHub provides an impressive set of features designed to make the development process more collaborative and more productive.
Monstra new repository: https://github.com/Awilum/monstra-cms (Monstra old repository)
Log in to GitHub
Fork the Monstra Repository
Edit files within your fork. This can be done directly on GitHub.com at http://github.com/{your-username}/monstra-cms
Submit a Pull Request (tell Monstra about your changes)