Child Theme adding function.php adding "Header" Widget Area

Hi guys,
I need your help please.
Many times I have tried to create a function.php file in my child team and it would never work, therefore I have given up and gone ahead editing the main function.php from the theme folder itself (I learned how to use filezilla and wordpress on my own, therefore I do not have a strong knowledge).

I would like to have a currency widget (which I already have) on the header of my site, in order to be visible in every single pages:

debruir.com

About the “Header” widget, I have followed the instructions written in the following post but I never succeed:

https://wordpress.org/support/topic/child-theme-adding-a-header-widget-area?replies=23#post-6274259

I have pasted the following codes in my function.php:

<?php
// Add a widget.
if (function_exists(‘register_sidebar’)) {
register_sidebar(array(
‘name’ => ‘Extra Widget Before Header’,
‘id’ => ‘extra-widget’,
‘description’ => ‘Extra Widget Before Header’,
‘before_widget’ => ‘<div id=”%1$s” class=”widget %2$s”>’,
‘after_widget’ => ‘</div>’,
‘before_title’ => ‘<h2>’,
‘after_title’ => ‘</h2>’
));
}
// Place the widget before the header
add_filter (‘before_navbar’, ‘add_my_widget’);
function add_my_widget() {
if (function_exists(‘dynamic_sidebar’)) {
dynamic_sidebar(‘Extra Widget Before Header’);
}
}

By doing this operation I can see “Extra Widget Before Header” on my WordPress dashboard but, whenever I drag and drop the widget in the “Extra Widget Before Header” container, it wont work on the front end of my website.

Am I doing anything wrong?
I appreciate your attention guys and I hope I can finally solve this issue.

Thanks.