Do you want to redirect your entire domain to another URL or do you want just one particular page to redirect?
The former is easily done with a Redirected Domain via the Dreamhost control panel under "Domains>Manage Domains". Click the "Edit" button in the Web Hosting column to edit the hosting for your domain and make it a redirected domain.
You can otherwise use php to redirect users from one page to another:
header( 'Location: http://www.domain.com.br/forum' ) ;
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