Feed Help – Author

I read in another post how to only see the feed of articles from one author… it said to use this:

http://www.myblog.com/?feed=rss2&author=

I enter this:

http://www.theamericanmoderate.com/?feed=rss2&author=admin

I have also tried the display name. Both times I only get a short RSS file without any of the articles that I have written, but the main RSS shows all of the articles. What am I doing wrong?