example to replace job_manager_locate_template via filter?

hello – having a few issues using my own custom templates for your plugin. Tried copying the files to my them with no luck… I want to try this method but not exactly sure what the variables should be?

$template = ? (single?)
$template_name = ?
$template_path = ?

return apply_filters( ‘job_manager_locate_template’, $template, $template_name, $template_path );

I presume I place this in functions.php

Many thanks & any points welcomed!

https://wordpress.org/plugins/wp-job-manager/