Hi,
unfortunately our core team do not have the resources here to help people use the open source code version. We provide a service where we can customise the app for anyone who needs it including the Push notifications (Airnotifier) service management. This service helps fund the improvement of the app in general: https://moodle.com/mobileapp/
I'd recommend you to check the Moodle FAQ and Moodle docs linked from the main forum page.
Regards, Juan