Q: What does unknown0023121250f5 mean and how can I fix it?

I want to change the short username from perrywilliams to shinda.  The current user is Shinda in the Users & Groups preference pane.

Hi,

Thank you for your help!

When I change the directory name and open the terminal, 'directory does not exist' is generated.  Also, the instructions for enabling the root user in Mac OS X Moutain Lion are fine up to the point where they state that the user set up a password for root.  I didn't see that option.