1) Please, visit the Zoom official website
and click on Sign Up, It's Free
as it is shown on the picture below.
2) Confirm your date of birth and push Continue
3) Then enter your work email address and captcha code. Click on Sign Up
4) Once you sign up you will receive a message from Zoom in your email. Check it to finish registration.
If you're having problems registering your Zoom account, watch this video tutorial.