permissions on server

I'm charged with managing the server for a very important client.  My latest 
tasks requires setting up a unique password for a single directory on the 
domain.  I've set up the directory, no problem.  But now I need to know how 
to give it a password so a third party can have access to that isolated 
directory.  I still want to maintain master access to this folder, of course.

I've got Dreamweaver which has an FTP command prompt. What command(s) do I 
use?  I found one instance on newsgroups that mention doing this:

site chmod (your permission) (your file or folder)

Is this correct?  Would you translate it a bit... I'd like to learn what each 
word is doing so I know for a fact I'm doing what I want done. 

And while you're at it, plug in the correct text for me.  The server name is 
"seattlenetwork.com".  The directory is "nlimages".  For the purpose of this 
example, the password will be "password".  Before I go trying to do something 
I know nothing about, can teach me a little about what this?

Thanks for your help. :)
++Dan

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