How to start BLE transmission on UNO R4 WiFi so that it can be detected by BLE Scanner mobile app?

I have IDE 2.3.2 and installed latest Firmware for my UNO R4 WiFi Board.
Please tell me how to start the BLE transmission on the R4 Board so that it can be detected by BLE Scanner mobile App available on the Google Play Store.

install ArduinoBLE and use one of the peripheral examples that are part of ArduinoBLE. e.g. ButtonLed.

I installed ArduinoBLE library and now my R4 board is getting detected by BLE Scanner mobile app.
Can you please tell me where to find the ButtonLED example which you have mentioned. Thank you in advance.

Maybe you should read about the basics of using the Arduino IDE.
Select the sketch from File -> Examples -> ArduinoBLE -> Peripheral -> Buttonled
Compile and upload.