It's really simple to automatically add Zoom web conferencing to meetings scheduled with FreeBusy:
- Go to the Account page.
- Click on Add More Calendars & Integrations tab.
- Find Zoom and click Add.
Sign in with your Zoom credentials and your Zoom account will be automatically linked to your FreeBusy account.
Then refer to this guide on how to select your default conferencing provider for meetings scheduled with FreeBusy.