Delete the Users

[Ruel Luchavez]

Hi..
I could log-in as a root in the data server of my friend, he give me a task
to delete some
users that he added in the server few months ago.
Unfortunately, I've tried reading in other blogs but none of them is
correct, there are some
but at the end its not what i want.
I know how to add users using command "adduser' but i cant trace after I add
user where should
be its directory?where could i find the list of users in the server? what
would be the command to delete
the user?

I really need your HELP..Thanks!