How do I access the discussion options subpanel

Hello, I am trying to figure out how to access the discussion options subpanel. I am a founding member of a wordpress blog and would assume I have the priviliges necessary to do so, but I cannot seem to find any tab that will get me to the adminstration options for discussions as I am trying to set up comment moderation due to some aggressive commentors making my life difficult. So far the other founding member claims to have access to these options and has used them, but I have not been able to and as the person who is around far more often to catch these types of comment abuses I am trying to find a way to do so as well.

The other user is the one who set up the site and invited me in as a writer first (as per an agreement) so I am wondering if this is a problem with not having certain priviliges because he screwed up in adding me. If so can this be remedied in any fashion or would I have to open up my own webpage in order to do this.