How do I allow people to add events to Events+

How do I allow subscribers to add events? I setup a page w/code to add events. When I'm logged in, the page shows up and I can add, etc. However, when I log out and go the add event page, it comes up blank. The link to the Events (Calendar) page is:
and Add Event: It's a good plugin and would like to be able to keep it. Thanks all... Sue