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You need to setup it in your .htaccess file, it should looks like this one:

<IfModule mod_rewrite.c>
RewriteEngine On

RewriteBase /

RewriteCond %{HTTP_HOST} ^yourdomain\.com$
RewriteRule (.*) http://www.yourdomain.com/$1 [L,R=301]

RewriteRule ^index\.php$ - [L]

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>