Open the example, “Files” -> “Examples” -> “AmebaBLE” -> “BLEScan”

Upload the code and press the reset button on Ameba once the upload is finished.
Open the Arduino serial monitor, and you should see the scan results of nearby Bluetooth devices formatted and printed out.

If you have the Bluetooth app nRF Connect installed, you can also use it to send out Bluetooth advertisements for the Ameba to pick up.