Okay so you have forgotten your mysql root password and need to access you mysql server. This howto requires root access to the shell or via sudo:
First stop your mysql server via the init script:
Now lets start up the mysql daemon and skip the grant tables which store the passwords:
You should be able to see mysql starting. Logon to mysql with the fowling command:
mysql --user=root mysql
Now change the password with:
update user set Password=PASSWORD('new-password') where user='root';
Now kill your running mysqld, then restart it normally. You should be good to go. Try not to forget your password again.