[Zope] LoginManager - how does it work?

[ed colmar]

I've managed to get loginManager to install, but I am very confused as to what to do with it.   I've read the how-tos on zope.org, and the documentation of LoginManager itself...  But I still don't understand what is supposed to happen.   A User Source is a location to find users, Say, my SQL database, right?   How do I tell it to use the SQL methods I have for retrieveing passwords?   The how-tos say to create dtml-methods called "userAuthenticate" "userExists" and "userRoles".  Where do these go?    Can anyone help me see the light on this?   Thank you