Set different users

Hello!
This plugin was all that I was looking for!, great job.
I just need one more thing of it but Im not sure if I can do it.

I need to set different users each one with a different password, Can I do that? The way to do that is in the users tab of the WP menu?

I think that I can set different users but not different passwords.

Thak you!!

http://ww.wp.xz.cn/extend/plugins/private-only/