See themes section at WordPress.ORG - also be careful of free themes from the internet - lots of junk out there that has Malware embedded in the themes that will do bad things to your blog or even ruin it
The site you are asking about does not seem to be hosted on WordPress.COM so you need to make friends over at WordPress.ORG the keepers of the software you are using.
This site is for support of sites hosted on WordPress.COM. You should address your questions to WordPress.ORG the keepers of the software you are using: http://wordpress.org/support/
For more on the difference: http://support.wordpress.com/com-vs-org/