Change text Skills field in Submit Resume form in WP Job Manager Resume Manager to dropdown. Add this code to your functions.php

functions.php

<?php
add_filter('submit_resume_form_fields', 'change_skills_submit_resume_field');

// // This is your function which takes the fields, modifies them, and returns them
function change_skills_submit_resume_field($fields)
{

	// Here we target one of the resume fields (skill) and change it
	$fields['resume_fields']['resume_skills']['type'] = "term-multiselect";
	$fields['resume_fields']['resume_skills']['taxonomy'] = "resume_skill";
	$fields['resume_fields']['resume_skills']['placeholder'] = "List of relevant skills";

	// And return the modified fields
	return $fields;
}
?>