Olá,
Para alterar, siga os passos:
1 – Abra o console do SSH
2 –
service apache2 stop
3 –
service mysql restart
4 –
mysqld_safe --skip-grant-tables
5 –
mysql --user=root mysql
6 –
update user set Password=PASSWORD('neovasenha') where user='root';
7 –
flush privileges;
8 –
exit;