[Zope] very beginner question

[John]

I have just started with Zope. I have gotten it built and running, and using squishdot (very cool.). I have the following question ( which I havent been able to find an answer to). 
The situation:
I create a folder( say folder_a), put various items in it, and create a user who will be able to edit the documents,etc. I want this user only to edit what is within folder_a. How does such a user log into Zope?
I.e. www.zope.com:9673/manage   doesnt work.  should it be www.zope.com:9673/folder_a/? or www.zope.com:9673/folder_a/manage?  I am sort of embarrassed to be so lost at such a beginning point.

john