gistfile1.php

add_filter( 'submit_job_form_fields', 'job_manager_terms_conditions' );
function job_manager_terms_conditions( $fields ) {
  $fields['job']['terms'] = array(
    'label' => __( 'I accept the Terms & Conditions', 'job_manager' ),
    'type' => 'checkbox',
    'required' => true,
    'placeholder' => '',
    'priority' => 50
  );
  return $fields;
}