$cfg['Servers'][$i]['user'] = 'YOUR USER NAME IS HERE'; 
$cfg['Servers'][$i]['password'] = 'AND YOU PASSWORD IS HERE'; 

Stop the MySQL process.

Start the MySQL process with the --skip-grant-tables option.

Start the MySQL console client with the -u root option.
 
List all the users;
SELECT * FROM mysql.user; 

 Reset password;
UPDATE mysql.user SET Password=PASSWORD('[password]') WHERE User='[username]'; 

--------------------------------------------------------------------------------

 But DO NOT FORGET to


Stop the MySQL process 

Start the MySQL Process normally (i.e. without the --skip-grant-tables option)
 
when you are finished. Otherwise, your database's security could be compromised.