phpMyAdmin 'pma' user with empty password set

phpMyAdmin 'pma' user with empty password set

Our vulnerability scanner is complaining we have the pma phpMyAdmin user set with an empty password. 

This is a Windows server. Where can I find config.inc.php file so that I can set a password for the pma account? 

Also, does anyone know if setting a password there would mean I would need to update the account elsewhere?

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