Mountain Lion won't allow me to enable root user

Hi, I'm new to everything Mac, but I'm trying to learn. Just purchased a used mid-2011 iMac from an individual. I love the iMac. Just a few kinks to work out. One is that he had originally named either the user account or home directory (I still can't figure out which) and i'd like to change that name. I found an Apple support article on this (Article HT1428) and I am hopeful it will work for me. However, the first step is to enable the root user. I went to Article PH11331 to follow steps to enable the root user. However, when I select Edit from within the Directory Utility, I am unable to select "Enable Root User", or even "Disable Root User" or "Change Root Password" for that matter. These options are either not there or are greyed out ("Enable Root User" is greyed out). So I have failed to even jump the first hurdle (enabling root user) towards my goal of changing the user account or home directory name (sorry I don't know which is which). Can anyone offer some advice please? Thanks!

Mac Basics: Time Machine
Back up all data to at least two different storage devices.
Boot into Recovery, launch Disk Utility, and erase the startup volume. This operation will destroy all data on the volume, so you had be better be sure of your backups. Install OS X. If your Mac was upgraded from an older version of OS X, you’ll need the Apple ID and password you used to upgrade, so make a note of those before you begin.
When you reboot, you'll be prompted to go through the initial setup process. That’s when you transfer the data from one of your backups. For a walkthrough, see here:
Using Setup Assistant
Don't transfer the Guest account, if it was enabled on the old system.
Note: You need an always-on Ethernet or Wi-Fi connection to the Internet to use Recovery. It won’t work with USB or PPPoE modems, or with networks that require any kind of authentication other than a WPA or WPA2 Personal password.

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Mountain Lion won't allow me to enable root user

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