1. Navigate to the Menu on your TV screen by pressing the Home button on your remote control.



  2. Select Connected Devices.

  3. Choose the input source that is connected to your TV.



Source: https://www.samsung.com/in/support/tv-audio-video/which-button-shall-i-press-after-connecting-an-input-device-to-samsung-tv/?srsltid=AfmBOooM-G1VklxfVRjS1Px811f6LQTf0Q9GhUEeIW33RtO8ZobgsLp8