Loading an event map is straightforward. Go to the View | Options | Maps property sheet and type in the filename of the map and hit enter or browse for one by pressing the button labelled with an ellipsis (...). If the file loads succesfully, you will see the event map information in the list below. This file will be loaded every time CDJ starts. CDJ defaults to loading an event map file called maps.txt if you have not specified your own file.
Currently, CDJ has no provisions for editing event maps. You must edit your event map files using a text editor such as Notepad. There is no need to restart CDJ each time you make changes to your event map - you can reload it by hitting the reload button.