The Caudium webserver is distributed under GNU's General Public License version 2. You should have received a copy of the GPL License in the file COPYING. For more information about Caudium, go to our website at caudium.net.
Pressing one of the tabs at the top of the page will select that section of the configuation interface. Pressing the selected button will focus on the top node of that part of the interface.
It will probably make sense once you try it. You can always see where in the configuration interface you are by looking at the top of the page.
There are usually one or more buttons at the bottom of the page, to do things that do not fit nicely in the 'node with subnodes' metaphor, like adding a new virtual server, unfolding/folding more than one node at the time etc, at the top or bottom of the configuration interface.
Some buttons, like the 'add a new module' button are only available in certain nodes (when a node of a certain type has been focused).
If you have any questions or problems, first look at the documentation. You can also join our mailing lists or ask in IRC. Please report any bugs you find to our bug tracking database. Before reporting a bug, make sure it isn't reported previously.