First, check what version you have by going to your You tab. At the bottom of this page, you should see the version number (ex. v.650.0)
If you have an iPhone you can update in the App store. If you have an Android phone you can update in the Google Play Store. Just search for Heja in either of the above, and press the update button.
Important:
Sometimes you will see a Open button instead of an Update button. In this case please press the Heja app icon beside the button and the button will change to Update. This happens when we release updates in quick succession.