cannot get "Customer Reviews" to work despite settings in Admin

Hi, I got Maian Cart installed perfectly, and added a product. Everything works great, except I can't seem to get "Customer Reviews" to work.  I tried enabling "Disqus" (of which I have an account but didn't see a way to input my data) and disabling it as well, and I always get "Customer reviews not available".  Wait, do I need to be logged on to a buyer account first?