The MiRoapp is supported on (reasonably recent) Android and iOS devices. Find MiRoapp through your usual channel (the Google Play Store for Android, or the Apple App Store for iOS). Search for 'MiRoapp' in either store.
I am a demonstrator
If you only want to run the demo, open MiRoapp, connect to your robot, go to the Controller page, and start the demo controller. For notes and suggestions on how to wrangle your MiRo-E in demo mode, please visit the Wrangling page.
If you only want to run the robot in remote control mode, open MiRoapp, pair a suitable controller, then go to the Controller page and start the remote controller.
I am a developer
If you only want to get connected to your robot for development, open MiRoapp, connect to your robot, provide the credentials for your wifi network, and reboot. When you reconnect with MiRoapp after the reboot, you will be able to read back the IP address your robot has been assigned, and get started with the On-board or Off-board developer profile.