This example (found in the Adafruit_WICED_Arduino/examples/WiFi folder) will scan for access points in range of the WICED Feather.
No particular setup is required for this sketch since it scans for available access points within range of the WICED Feather.
You can compile and flash your sketch to the WICED Feather using the 'Download' arrow icon at the top of the IDE:
You should see the USB DFU progress as the update advances, and there will be a 'Done Uploading' message in the top left of the status bar when you are done:
Wait a few seconds for the USB CDC serial interface to enumerate, and then open the Serial Monitor using either the Serial Monitor icon in the upper-right of the IDE or via Tools > Serial Monitor:
This will cause the WICED Feather to start scanning for access points in range: