To reset the MySQL root password in WebHost Manager (WHM), you can follow these steps:

1. Log in to WHM.
2. Go to SQL Services > MySQL Root Password.
3. Enter a new password for the MySQL root user in the New Password and New Password (again) fields.
4. Click the Change Password button.

WHM will restart the MySQL server and apply the new password.

Note: It is important to choose a strong password for the MySQL root user. A strong password is at least 12 characters long and includes a mix of upper and lowercase letters, numbers, and symbols.

Alternate method:

If you are unable to log in to WHM, you can reset the MySQL root password from the command line. To do this, follow these steps:

1. Log in to your server as the root user.
2. Stop the MySQL server:

service mysql stop

3. Start the MySQL server in safe mode:

mysqld_safe --skip-grant-tables --skip-networking

4. Connect to the MySQL server as the root user:

mysql -u root

5. Reset the MySQL root password:

UPDATE mysql.user SET password = PASSWORD('new_password') WHERE user = 'root';

6. Flush the privileges table:

FLUSH PRIVILEGES;

7. Stop the MySQL server:

quit

8. Start the MySQL server normally:

service mysql start

You should now be able to log in to WHM using the new MySQL root password.

Note: If you are using a managed hosting provider, you may need to contact them for assistance resetting the MySQL root password.