I'm really not any good in programming and I have a question.

I understand that users who have logged in with an album password, actually stays logged in until windows clears the cookie history. That can be a problem on shared computers. Therefore, you guys came up with the user log out plug-in (I guess..)

Can anybody explain to me (in plain english, step-by-step) how this works, which code to copy and where to place it.

In the tutorial it says: "Place a call on printUserLogout() where you want the logout link to appear" ... that doest tell me anything really!

That means you need to place that function on your theme files where you want the logout link to appear.

So do I just paste this part into my html document, without further editing?

void printUserLogout( [string $before = ''], [string $after = ''], [bool $showLoginForm = false] )

No, only the function itself, just look at how it is done in themes and please read this: http://www.zenphoto.org/2008/04/how-to-read-the-zenphoto-functions-guide/

So i did, but I'm sorry im not good at this. (Still learning)

Do I place This on my index page then:

``

Yep, but don't forget the closing semicolon: ``

I'm sorry but I could not make this work?

I pasted the code above into the index.php file in the themes folder.
When I loaded the page, a new password box appeared, not an option to log out. I can only log out when im logged in as admin, not as a user viewing an album?