phe.le on "Hiding the admin username and urls"

I would do three of the following:

1. Edit the template to not display the admin username and url.

2. Use robots.txt to hide the admin page from search engines.

User-agent: *
Disallow: /author/admin/

3. Redirect that admin page to another page such as homepage.
http://wordpress.org/extend/plugins/redirection/