Postorius configuration help

[Georg]

Hi list,

I'm looking for a good description for postorius configuration. The Arch 
wiki is unclear to me, and the mailman documentation points to 
postorius.org configuration, who then points to another mailman doc 
providing little info on the actual configuration.
Long story short, I'm failing to set up postorius so I can create users 
and let them log in. It would be highly appreciated if someone 
proficient in this topic is willing to walk me throuh. I'd then amend 
the wiki for more clarity.

Thanks in advance
Georg