/usr/bin/mysqladmin -u root -h yourhostname.yourdomain.com password 'new-password'?
 

What does the command mean?
In my case it's:
because that's what I get when issue 'hostname' command.
Whenever I enter it I get usage manual... Any help pls????

Thanks

can't you just read man mysqladmin ?

You haven't finished your installation. Give it a real hostname. Another host won't be able to reach your mysql server because localhost will refer to itself.