Wocomerce Price Symbol Issue

Hi Ateeq 

 Hope you are well and enjoying your life . 

Dear I have added products on my client's website and I selected the price in Saudi Arabia riyal which symbol in English must be SAR and in Arabic version website, the Price sysmbol must be ر س . 

But unfortunately in English and Arabic version both it shows ر س . Click the following link to check

https://www.screencast.com/t/ShURVou4

I tried to change through function.php because as per WoCommerce help page we can just copy some codes and paste it on theme function.php

add_filter('woocommerce_currency_symbol', 'change_existing_currency_symbol', 10, 2);

function change_existing_currency_symbol( $currency_symbol, $currency ) {

     switch( $currency ) {

          case 'EUR': $currency_symbol = 'Eur '; break;

     }

     return $currency_symbol;

}

but I could not found the area where wocomerce help page showed to paste the custom code on function.php 

can you please help me 

You can find Function.php in theme files. Please go to wp-admin >> Appearance >> editor then on sidebar right you can find the functions.php file in which you can enter your custom codes by you or given by your plugin authors.