After googling for 2 minutes, I've found http://www.hamishgraham.net/post/Enabling-Disqus-Comments-in-BlogEngineNET.aspx on how to set up DISQUS on my blog, which is a lot nicer tool than blogengine's default comment system.

I just want to thank him for providing me this tool.  If anybody else is using blogengine and trying to set up DISQUS, that's a good reference to go to.