Default Type of Notification as Pop Up

In Zoho Calendar, where do I set the default type of notification (reminder) for calendar events that I add? Likewise, on my iPhone, where do I set the default type of notification?

I prefer to have notifications (reminders for items on my calendar) to pop up, rather than be emailed, in order to cut down on the amount of email messages in my inbox.

Thank you in advance,

Wade