The best way to join is via a computer, but you can also connect through your mobile phone or tablet. To save time, you can view tutorials on the Zoom website [Click for Zoom Tutorials] and then you can download the app at [Click for Zoom app download page].
Once you are connected, look to the bottom left on your computer (or touch the screen on a mobile phone or tablet) to check that video and audio are connected.
If you have a problem connecting, close the Zoom app and try clicking the above link again.