Post-Configurator does not yet include a GUI for editing DEF and CDL files, but there is done work on it.
You should also attend a post configurator class to make sure you work according to the best practice guide.
Currently you will have to do these things manually:
You should now see the output of your UDEs.
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Stefan is absolutely correct. We released an editor for DEF elements with NX11.0.2 and working on an editor for the UDE for Post Configurator.
Stay tuned, we will announce it as soon as it is done, but it is in the making right now.