Currently, the only way to refresh the app is to:
  1. Press the home button of the iPhone (where is the home button? See image below)
  2. Press your mobile app icon. (This is the icon you created when you added it to your home screen of the iPhone)

Result: 
These actions will cause the app to reload the last page you visited along with any recent browsing history (currently the mobile app saves the last 10 pages visited).