Can't find user account when trying to delete

Question

I'm using an iMac computer.
And the problem I'm having is the following:
I'm trying to delete an user account from my computer following the steps from apple.
         http://docs.info.apple.com/article.html?path=Mac/10.5/nl/8163.html
So at step 3 they say I have to click on the user account I want to delete.
But I cannot see the user account in the list.
It is the only account with an password, but that person doesn't know the password even with the clues for it.
Besides that I currently don't have the option to contact him.
I am the main user so I hope it shouldn't be a problem.
Does anyone know a solution for my problem?
Or did anyone had the same problem?
My thanks in advance!

Answer 1

'Other' is the Root account - it shouldn't be enabled.
From any admin account -
How to disable the root user
Mac OS X v10.6 and later
    1.    From the Apple menu choose System Preferences....
    2.    From the View menu choose Accounts.
    3.    Click on the lock and authenticate with an administrator account.
    4.    Click Login Options....
    5.    Click the "Edit..." or "Join..." button at the bottom right
    6.    Click the "Open Directory Utility..." button.
    7.    Click the lock in the Directory Utility window.
    8.    Enter an administrator account name and password, then click OK.
    9.    Choose Disable Root User from the Edit menu.