Plugin Configuration

My domain mapping plugin suffiexes the source-redirect address with /blog.

http://fatigueo2.com becomes http://fatigueo2.com/blog during configuration.

The intended behavior is to redirect http://fatigueo2.com to http://whnlive.com/blog/fatigue

How should I configure to get this to work?
What Cname entry should I use?

The domain mapping plug-in explicitly declares that subdirectory installs are supported - so it seems like it should work...