how to make SAMBA with user accounts?

Hi
I have WL-500W router (almost the same as Gp), and i have Oleg's firmware installed in it. I've configured my router with tutorial http://wl500g.info/showthread.php?t=10307.

There is many samba tutorials on this forum, but no one told me how to configure samba users accounts

Can anybody help me to reconfigure SAMBA2 to use user accounts. I do not want to have public shares, but user accounts manager in SWAT seams not to work. How i can disable guest access and make the router grant shares on different user accounts?
BTW - where(and why) the samba users accounts disapeared in oleg's firmware web interface? In the original ASUS interface there was possibility to create samba users accounts :(