How to link WhatsApp on PC/Laptop from Android Smartphone App; Step by Step Guide | Whatsapp Web
visit https://web.whatsapp.com on your computer. Make sure it is the official client or website .When prompted with a QR code, use the QR scanner within WhatsApp to scan the QR code. To do so, open WhatsApp on your phone.
1. On Android: in the Chats screen - Menu - WhatsApp Web.
2. On iPhone: go to Settings - WhatsApp Web.
3.On Windows Phone: go to Menu - WhatsApp Web.
4. Scan the QR Code on your computer screen from your phone.