1 Sign up for a new free account at
Disqus.com. You should enter the domain where your blog is installed or going to be installed NOT the full path TO the blog. So, if your blog is at 'http://www.example.com/blog/', you would enter 'example.com'.
2 Access your Maian Weblog administration interface and navigate to:
Settings > Social Settings > Comments
Enter your Disqus short name into the box provided and also a category ID if applicable.
Disqus is now enabled. You can totally disable Disqus again by removing the short name from the settings.