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Sign up for a free Disqus Account. Scroll to the bottom of the Disqus home page and click the "Get Started" button.
Once the acount has been opened, all that is required is the Disqus Shortname which is entered into the widget settings.
To identify the comments with a particular page of the site, enter the page URL and a page ID which can simply be the page name.
The comments widget should be the last item on the page to allow it to expand downwards as comments are added. Checking a box will allow a fixed height to be added and any overflow will scroll.