How to connect zoho bookings and Salesforce?

How to connect zoho bookings and Salesforce?

Hello!

I just created my very first account on Zoho and started to play around with Zoho bookings. One thing I can't figure is how to integrate Salesforce with Zoho bookings. I don't see any "connection" button on my account. Does anyone know how to connect to Salesforce? 

What I wan to do is to sync Zoho appointment with a Salesforce custom field. I am not sure if it is possible.

Thank you in advance!
Hideko