login and logout

[jumper]

Hi everyone, I'm really new at this so I will have some dumb questions for a while. I've searched a lot for what I'm looking for but don't seem to find it. Also, if someone knows where there is documentation for VirtueMart 2, could you please give me a link. Here are my issues... oh I'm using the latest updated version.

1. When I bring up my website, There's no login and when I get ready to leave, there's no logout.
2. I'm trying to create a place for artists to sell their work. Do I need two login choices (artist,buyer). Is there an easy way to do this?
3. I still have the stock categories, but would like to change them to different art forms. How do I do that?
4. Where are the psd files located so I can change the logo?

Guess that's enough for now. Even if you don't know all the answers, I would appreciate any answers to any of the above questions.

thanks a bunch,
jumper