Please follow the steps to use WhatsApp on computer
Open https://web.whatsapp.com/ in browser
You will see QR Code
Select the checkbox "Keep me signed in"
Now Open WhatsApp app on mobile phone
Make sure you are already registered on WhatsApp
Tap Menu
Tap WhatsApp Web
Scan QR code on computer
You will see chat(s) in browser
Mobile phone needs to be connected to internet to use WhatsApp Web on computer.
