title: Xamarin Forms iOS. Change Back Button
body: <p>I am trying to use the sample code mentioned at <a href="https://developer.xamarin.com/recipes/ios/content_controls/navigation_controller/change_the_back_button/" rel="nofollow noreferrer">https://developer.xamarin.com/recipes/ios/content_controls/navigation_controller/change_the_back_button/</a> to properly customize the back button in my Xamarin Forms project (I am using Master Detail Page) but I do not know exactly where I should put those lines in my code.</p>
  
  <p>Anyone can help?</p>