Once you complete this first step, you will have to wait a few moments for your conversations and groups to sync, and then you'll be ready to go. You just need to use the WhatsApp app on your smartphone to scan the QR code on the computer screen. To be able to start using WhatsApp Desktop, the first thing you have to do is sign in with your WhatsApp account, which is a quick and simple process that will only take a few seconds. Thanks to this client, you can easily read and write messages on your computer without checking your phone each time you get a notification. WhatsApp Desktop is the desktop version of WhatsApp, one of the world's most popular instant messaging clients.