[otrs] Problem with installing and using OpenTRS

Hello, I am trying to install and configure OpenTRS on SuSE 7.3 from source. Now I am at a stage where I cannot login to the system using Login: root@localhost and password. I don't know where otrs looks for passords MySQL's users table or otrs' user. Ia have this message on the /var/log/messages file: OpenTRS[4427]: [Notice][Kernel::System::Auth] User: root@localhost with wrong Pw!!! If otrs is using otrs' user table, how can I change the passowrd? I have tryed UPDATE user SET pw=PASSWORD('otrs') where login='root@localhost'; and UPDATE user SET pw=';trs' where login='root@localhost'; but without success. Best regards. Erdal Mutlu