Missing sync button?

Missing sync button?

I just signed up for Zoho calendar, after reading fantastic reviews.  I would like to sync it with my Google calendar, which is what I use currently.  The instructions tell me to click "settings", then "sync" - but when I click "settings", there is no "sync" button.  Any idea on why?

I read that you have to be signed up for Zoho Mail to use the Google two-way sync, so I signed up for mail.  But now I can only figure out how to access my calendar through the mail app, and when I click "settings" it looks totally different than what the step-by-step tour shows.

What am I doing wrong?
Thanks!