Url friendly by HTACCESS

I'm working on pure PHP and I want to work in ajax with friendly urls but I do not know how to configure the htaccess or where to locate it.

What have I tried?

create the .htaccess with RewriteRule ^utilities/(.+)\.php utilities/functions.php?function=$1

but I do not know where to locate it, since I have the following, www.dominio.iq/tv/views/administrator/home.iq - > vista www.dominio.iq/tv/js/administrator/functions.js - > ajax which contains the following code

 $.changePassword = function (){
    var parametros = {};
    $.ajax({
        data:  parametros,
        url:   '../../utilities/changePassword.php',
        //dataType: "json",
        success:  function (response) {
            console.log(response);
        }
    });

  }

www.dominio.iq/tv/utilities/functions.php - > controller which has a function

<?php
function changePassword(){
      //$oldPassword = $_GET['oldPassword'];
      //$newPassword = $_GET['newPassword'];
     //Y ya lo actualizaria en la bd
     echo "llego";
}
?>

so the idea is that when I do this url: '../../utilities/changePassword/parametros_1/parametro_2/...parametro_n', go to url: '../../utilities/functions.php to the call changePassword() and receive the parameters that I sent if necessary.