I am trying to activate root account on my MAC. The directions I've seen do not match what is in System Preference for Accounts or Users

I am trying to activate the root account on my new Mac Book Pro. The instructions that I have found do not match what I have in System Preferences. What is the process when using Users and Groups. When I click on Join the Network Account Server- Open Directory Utility I don't see a option to activate root user as the instructions say at http://support.apple.com/kb/HT1528

OS X Lion

1. From the Apple menu choose System Preferences....
2. From the View menu choose Users & Groups.
3. Click the lock and authenticate as 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 Enable Root User from the Edit menu.
10. Enter the root password you wish to use in both the Password and Verify fields, then click OK.