I would like to use the universal code and have ran into difficulties getting the most basic functionality done.
I would like to create a shortname for test<
None of the solutions above worked for me as of September 2013.
To get it to work I had to add localhost to the "Trusted Domains" list on this page:
http://[disqus_shortname].disqus.com/admin/settings/advanced/
and also use the "Universal Code" found below to embed it into my blog posts:
http://[disqus_shortname].disqus.com/admin/settings/universalcode/
And it works! :)