Ok, sorry for not being clear.
What I want to do is to test Ubb.threads on my own computer. It is not really a server, but since MacOS X can be used as a server (a small one, tought), I tought I could use it on my computer. That's because, right now, where my web site is hosted, I'm not allowed to use either PHP or MySQL. And before upgrading my web site, I want to test the software to see if it correspond to what I'm looking for.
Maybe I have to set those informations somewhere, but I don't know where or how.
When I say that I'm the system administrator, I just mean that no one else is administring my computer, so I cannot refer to someone else.
I hope it is a little bit more clear.
