1 Sign up for a new free account at
Disqus.com. You should enter the domain where your store is installed or going to be installed NOT the full path TO the store. So, if your store is at 'http://www.example.com/cart/', you would enter 'example.com'.
2 Access your Maian Cart administration interface and click on:
System > General Settings > Settings Menu > Social Network Settings
Enter your Disqus short name into the box provided and also a category ID if applicable.
Disqus is now enabled. You should then also enable disqus for the relevant category and products you wish to have comments as an option. You can totally disable Disqus again by removing the
short name from the settings.