The “REDESIGN YOURSELF” text on the linked website appears to be the blog’s tagline – a short sentence or catch phrase describing the blog. You can change your tagline via the field provided in the administration dashboard on the Settings > General page.
See this entry from WordPress.com’s support section for more information.
(note that while the WordPress Development community does not for the most part provide support for WordPress.com or it’s services, in this instance the linked article is relevant to the WordPress platform as a whole – both WordPress.com sites as well as custom installations of the WordPress.org open-source project).