tomsommer, thanks for your tip. Now, I will (try) translate to portuguese version...

Hi guys,
I installed this blog. It's very cool, but when I log in admin this happen...
Warning: Cannot modify header information - headers already sent by (output started at /home/joanop/public_html/muneo/blog/serendipity_admin.php:8) in /home/joanop/public_html/muneo/blog/serendipity_functions.inc ...