When you start the MiRoapp, it shows the page pictured here. Press the Bluetooth icon to start scanning for nearby robots. Any that are detected will be listed in the window.
Once your MiRo is detected, you can press and hold its entry in the list to give it a friendly name that you will remember. We have called this one, imaginatively, by its serial number "191507". Click once on the entry to connect to that MiRo and enter the Management page.
If the scan has finished and you want to re-scan, press the scan button again.
If no robots are found, check that location services are not disabled on your handset. Location can be inferred from Bluetooth devices, so Android requires that you enable this facility before Bluetooth scans will succeed.