There are 3 options and different types of adding events to Hirebee calendar.
When you change applicant's status - you can add interview invitation. (you can also set "add to calendar" in workflow settings, so calenar will be selected by default).
You can add to calendar without changing status - just click on Add to calendar in applicant profile. In this case you will send invitation for a meeting to candidate.
You can add a reminder - in this case there will be no any email for candidate. Just click on Add a reminder
When you create an event you should fill this information:
Title (by default there will be Stage name + candidate name, but you can edit this)
Date, time zone, time and duration
Interviews - your team members