This one will be blazing fast read, at least here. Instead of going all verbose on what I did lets link the places where I got the information from on how to use Disqus + Jekyll.
You gonna need to:
1 - go wild with disqus instructions page and registration
2 - the previous one probably won’t do so follow perfectly random post
3 - then if you get a little lost go to joshualande post
4 - by now everything should work just fine
Don’t forget to:
1 - register at Disqus, I know it sounds dumb to repeat this…
2 - add the comment scripts right after your post content
3 - change Disqus configuration variables (script)
4 - comment out or remove var disqus_developer = 1;, this is for test purposes only
5 - pay attention to comments count tricks they give you, in case you want to display the number elsewhere
Know you just have to get ready for the comments rain!