Sidebar on single question page

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I can not access your FTP, In this case, you can add the following code to the functions.php file:

/**
 * Register our sidebars and widgetized areas in question page.
 *
 */
function wpb_widgets_init() {
 register_sidebar( array(
 'name' => __( 'Question single sidebar', 'wpb' ),
 'id' => 'single-sidebar',
 'description' => __( 'Show widget into Single question', 'wpb' ),
 'before_widget' => '<aside id="%1$s" class="widget %2$s">',
 'after_widget' => '</aside>',
 'before_title' => '<h3 class="widget-title">',
 'after_title' => '</h3>',
 ) );
 }
 add_action( 'widgets_init', 'wpb_widgets_init' );

Then add the following code to the single-question.php file under line 21:

<div class="">
 <?php dynamic_sidebar( 'single-sidebar' ); ?> 
</div>