You can use this theme in several ways. For example:

1. Fork the theme repository.
2. In _config.yml change baseurl to /.
3. Change repository name to yournickname.github.io.
4. Go to Settings, and to Pages (“Code and automation” on the left).
5. Make sure that “Source” is set to “Deploy from a branch” and Branch is master and /.
6. Visit yournickname.github.io.

If website is not live, try to edit some file and try again.