Office365 Calendar

Hi Guys
I am looking at setting up a team of 9 we all use office 365 and for the life of me I cannot figure out how to set up the calendar. I have been trying to follow this tutorial https://www.zoho.com/crm/help/office365/ how ever it is completely different I do not get the option to enable the calendar.

Can anyone help? Also is there any real support for Zoho? I figure I need to know now before we get in to far.
Thanks
Paul