To connect your Zoho calendar to FreeBusy:
Go to sign up.
Or link new calendar if you're already signed in.
Provide the email address associated with your Zoho calendar.
FreeBusy will try to detect your calendar provider.
You can also pick Zoho manually.
Type in your password.
If your Zoho account has two-factor verification enabled,
enter an app-specific password instead.
Click Sign in.