sync more than one zoho calendar via CalDev?

I am just trying Zoho and I set up syncing with iCal. However, I have created two calendars in Zoho under one account, as I have currently two calendars in iCal. However, I can only see a way to sync the main Zoho calendar, which was created under my email address name, without the @xxxx. I cannot see a way to sync also the second calendar. I use the main one for work appointments, and the second one for notifications, such as payments due. Is this possible, to sync both calendars into iCal?

Thanks
Don