Use the UniFi Network app instead, available in the Apple App Store, and on Google Play.
Your device firmware may also be upgraded during the adoption process. For compatibility reasons, please ensure that the device is running the latest available firmware version.
Once your UISP server is online/running, you may proceed with the methods in this article - Ubiquiti recommends using the UISP Mobile App for simplicity. To quickly set up the UISP Application using Ubiquiti's free cloud-hosted platform, please visit this link here.