There are two way to start the transformation processes, on the callable it self, via contextmenu, or the launch configuration.
The launch configuration can be access from the run menu.
On the start callchain page you have to select the callchain file, and the callable to start. After selecting the file, the combobox is filled with the callables, where you choose you transformation to start. If you want to start the transformations in a chain, select the checkbox, if so you can select transformations that will be skipped in the transformation process.
On the set properties page, you can set values for defined properties, or choosing that a dialog get the value for that properties. There are four dialogs implemented at the moment.