I resently purchased a used imac with mac OSX 10.6.8 operating system. I want to change the name of the home directory/folder. I followed all the instruction in help. logging in and unlocking user accounts> clicking login options> join >open directory utility window>Unlock directory utility window, then i am supposed to enable "root user" from edit menu, but i don't see a "root user" in the window to enable. Where is the Root user?