Comment Error – Using Disqus

I’m having a conflict, I assume, with Disqus. I found a similar issue mentioned on themeforest.com but with no resolution and the guy’s site looks fine now, so maybe someone here can help me clear this up. I see someone else has asked this question before and been told to edit single.php, but they failed to mention exactly what to edit in single.php.

Any help would be very, very much appreciated.

See below for an example image:

Please advise, thanks!