Copy the file pibb-comments.php into your plugins directory (wp-content/plugins/).
Login to your WordPress Admin Panel
Go to the Plugins tab
Activate the 'Pibb Comments' plugin. (Click Activate in the right column).
You will now need to login to Pibb (https://pibb.com) and create a channel.
This channel (e.g. JanRain Blog) is where all of the conversation threads
for your posts will be stored. One channel can have many threads.
You will also need to get an API key, the API key can be found by clicking
on the 'My Profile' tab which (once you are logged in) is in the upper
right hand corner of Pibb.
Now associate your blog with your Pibb Channel (e.g. JanRain Blog) and API key.
To do this login to the admin panel and click on the "Plugins" menu and
then click on the "Pibb Configuration" sub-menu to enter your Pibb Channel
Name and API key.
That's it, go ahead and make a post and when you publish your post you will
have a Pibb thread embedded at the bottom, ready for realtime discussion
of your post. Please note the Pibb Comments thread will not show up until you
publish your post.