Reply Not Working in Studio Activity Stream

Hi,

Right now, I don't see the Reply function working properly here:

http://www.microsoftesque.com/activity/

I just wanted to reply to that person, who may actually be a real person, who actually joined my silly site about microsoftesque experiences. It's just a test site...and well...looks like it's serving its purpose...

I can't seem to reply...is it a theme error, a setting...?