There are three main steps to installation Git-Blog.
The easiest option to obtain Git-Blog is to clone the existing repository.
git clone http://github.com/dwueppel/git-blog
You can also get a copy via a direct download, however you will have to manually setup the git repo within the directory obtained.
Once you have your local copy of Git-Blog, you can branch the main repo to create your own website. This way you can pull any updates to the mainline source code and include them into your own repo as they are released.
git branch MyNewWebsite
With your new branch you are free to edit the existing markdown files and adjust the directory structure of the site.