Call app object in navigated page

Hi guys i just wanted to know how i am going to call app.preloader in a navigated page.
i used the kitchen and try this code in the about html but the app.preloader wont show.

use template page

  <button @click='confirmEmail'>Confirm</button>
return {
  methods: {
    confirmEmail: function () {
      var self = this;;

Thank You so much! :slight_smile: