Before you can use Zoom Video Conferencing, you must install the Zoom software for your device.
Start by going to the site https://zoom.us/support/download to download Zoom Desktop Client.
Zoom is also available on Mobile and Tablet.
If you haven't downloaded and installed Zoom, Zoom also works on your web browser with similar functionality to the installed software. It is advised to use the installed software since Zoom Web Client might lack some features. For a detailed list of Zoom Web Client features go to https://support.zoom.us/hc/en-us/articles/214629443-Zoom-Web-Client