How to scan QR code in viber app

i have a qr code reader on my phone SHOW ME A QR CODE

Mr Sagar, Can you tell me more specifically that My Qr code is not available anymore AT ALL SHOWING IT THAT I WILL CLICK THERE?? THEREFORE I COULDN'T USE IT IT IN PC................WOUL YOU PLEASE TELL ME RIGHT AWAY NOW

my cam doesn't even pop up. i't doesn't work

there is no more My Qr code is not available anymore

That's very helpful, thnx!