mgb,
as jester pointed out to you before, there was a similar question around a month ago. He even gave you a link to this thread. There is clearly stated that SME does not support Active Directory membership at the moment.
Although I don't really understand your new question, except that you want help for installing something, I would advise you to read again this article, which you are referring to. The author uses a Windows 2003 Server as an Active Directory server. In the course of the article he explains how he got the different linux clients to authenticate against that windows server.
So what do you want to install on your SME Server?