Accessing WhatsApp on your desktop
1. Installation
On Windows 10 install WhatsApp app from Microsoft Store
On Windows 7 go to https://www.whatsapp.com/download/ to download and install WhatsApp on your computer.
For all other platforms open https://web.whatsapp.com/ on a web browser to use the web based version.
2. When prompted, use the QR scanner within WhatsApp to scan it. To do so, open WhatsApp on your phone.
On Android: in the Chats screen > More Options > WhatsApp Web.
On iPhone: go to Settings > WhatsApp Web
Log out of Desktop from WhatsApp
Go to WhatsApp on your phone > Settings or Menu.
Tap WhatsApp Web > Log out from all devices > Log out.