If you have already downloaded the app and it was once working but does not seem to be now. Firstly visit the app store, search for the NZBA member benefits app, select it and you should have a choice to uninstall or update.  Try update first and choose the re-register option rather than the uninstall option.  If that does not work uninstall and view this video to re-install. If that does not work contact the administrator.