OS X V10.7 Lion :: Cannot Log In As Root Or Change Password

How to enable the root userOS X LionFrom the Apple menu choose System Preferences....From the View menu choose Users & Groups.Click the lock and authenticate as an administrator account.Click Login Options....Click the "Edit..." or "Join..." button at the bottom right.Click the "Open Directory Utility..." button.Click the lock in the Directory Utility window.Enter an administrator account name and password, then click OK.Choose Enable Root User from the Edit menu.Enter the root password you wish to use in both the Password and Verify fields, then click OK.For some reason this does not even booting for instalation media it says that the disc can not be changed.