You may not receive notifications if you did not authorise them when you first logged in.
On iPhone :
Go to phone Settings
Choose Notifications
Choose Bilder
Allow notifications
For Android (the process may vary from device to device):
Go to phone Settings
Choose App Settings
Click All Apps
Choose Bilder
Enable Notifications.
Once activated in phone settings, go to Mobile App settings and enable the feature:
Open Mobile App
Click three line in the left upper corner
Choose Settings
And check "Notifications from the application"
