Follow these steps to send out a Push Notification to your App users. There are options to schedule or choose a particular audience / segment as a sub-set of users. The default will be to send to 'BOTH' which will send out the Push Notification to both iOS and Android app users. Note that a user must have allowed for push notifications to be received on their device. 

Step 1: Click on the "New" button on the top right 

Step 2: Enter the Title and your Message to send users

Note that uploading "Image" is not mandatory. 

Step 3: Select Audience / Segment 

Default would be to send to "Both" which will send the notification to all iOS and Android app users. 

Step 4: SEND > Click on "Create" to send out your Push Notification. 

Note: 

There is an option for you to "Send Now" which will immediately send the notification OR you can "Schedule" date and time to send out your Push Notification.