Conzilla can be extended with plugins. The editor included in Conzilla is built as a (very large) plugin which can be left out if the need arises (such as when using the applet version for presenting maps in the web-browser).
The editor allows you to edit one Context-map at a time. To minimize the amount of configurations the editor makes use of sessions which among other things defines which information sources to edit.
To edit a map you choose edit in the file menu and then choose (or create a new) session appropriate to your needs. In edit mode you can:
When finished editing, press the disk symbol among the buttons at the top, the Context-map will implicitly try to save all dependent information sources.