You can scan for beacons by pulling down on the table view in the RadBeacon Configuration App.
Once your RadBeacon USB has been plugged in, or your RadBeacon TAG has been activated, the beacon will broadcast in configurable mode for an initial window of 30 minutes. If you are using the RadBeacon Config App to detect and configure your beacons, and are unable to recognize or access your beacons, it is likely that this configuration window has lapsed.
Re-initiating Configurable Mode
Configurable mode can be re-initiated for RadBeacon USB beacons by removing and restoring power to the device.
I STILL can't see my beacon!
If you've cycled power to your beacon and are still unable to recognize it using the RadBeacon Config App, you may be experiencing the results of an iOS bug that affects proximity ranging. Apple is aware of the problem and promising a fix. You should try turning off Bluetooth and then turning it back on again. If that doesn't fix it, try resetting your phone by holding down the sleep/wake button and the home button until the phone powers off. On restart the problem should be corrected.
If you are not seeing the RadBeacons in the app when you scan, the beacon is probably not in config mode anymore. This is a security feature. For RadBeacon usb, remove power and restore power. When you scan for the beacon, you should see it.
If you still aren't seeing the beacon then something maybe wrong with Bluetooth on your device and you can try clearing it's cache by turning Bluetooth off and then again.