Welcome to VL kge420.
You can add users and much more through vasm. It's there, on the menu (dunno where exactly).
You can do it through the console. man is your friend
man -k <word> finds all man pages related to <word>
grep filters text matching some words so
man -k user| grep add
will tell you commands and functions related to that. Then
will show you the info regarding each command.
More on that in: