Use the ‘Events ‘ tab in your dashboard to create or manage events.
When you create a new event you have a range of options: Title, date, summary, times, location, address, website, costs and image. You don’t really have to use any of these except the title and date. Nothing will appear on your site except those fields with something in them. You can set which fields display using the plugin Event Settings tab.
You can also add a detailed description with images, links and so on (just like a normal WordPress post).
This is only a very basic overview and the plugin has many other features that are not fully described here.
You can find some Further detail here.
If you have other issues or this is not clear, for pro customers please use the paid support contact, free customers please ask on the forums here https://wordpress.org/support/plugin/quick-event-manager/