The Redirect upgrade is intended to point an existing WordPress.com address site to a second, external site.
Is it possible you meant to purchase a domain-mapping upgrade instead? Domain mapping makes it so that when a visitor puts http://www.ocodex.com.br into the browser, they would reach your WordPress.com site, but still see http://www.ocodex.com.br in the browser address bar. You can read more about both upgrades here:
http://en.support.wordpress.com/site-redirect/
http://en.support.wordpress.com/domains/map-existing-domain/
Just let me know your goal and I'll help you get this set up correctly.