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It's at https://www.whatsapp.com/. You can download WhatsApp's desktop version from this site. This option is toward the bottom of the webpage. It's on the right side of the page. Clicking this button will prompt the WhatsApp setup file to download, though you may first have to select a download location. It will likely be in your computer's default "Downloads" folder (e.g., the desktop). Once it's done, you'll see the WhatsApp icon, which is a white phone on a green background, on your desktop. A white window with a green illustration will appear while WhatsApp is installing. Doing so will launch WhatsApp's login page, which has a black-and-white checkered box (this is a QR code). If you don't have WhatsApp on your phone yet, you'll need to install it on your iPhone or Android before continuing. Depending on your phone, the path to open the QR scanner will be as follows:   iPhone - Tap Settings in the bottom-right corner of your screen, then tap WhatsApp Web/Desktop near the top of the screen.  Android - Tap ⋮, then tap WhatsApp Web at the top of the menu. After a brief moment, WhatsApp will scan the code, which will give your computer permission to log into WhatsApp. You should now be able to use WhatsApp on your computer!  If the QR code has expired, click the arrow in the middle of it to refresh the code. If the code won't scan, make sure that all of the QR code is displayed on your phone's screen--you may need to increase the distance between your phone and your computer screen.
Go to the WhatsApp website on a computer. Click Mac or Windows PC. Click the green DOWNLOAD button. Wait for the setup file to finish downloading, then double-click it. Wait for WhatsApp to finish installing. Double-click the WhatsApp icon if WhatsApp doesn't open. Open WhatsApp on your phone. Open the WhatsApp code scanner. Point your phone's camera at the QR code.