We are very interested in your feedback. If find anything in this manual that you consider wrong, ill-formulated or explained in a too difficult manner, please don't hesitate to contact us at <bugs@trolltech.com>. Of course, you can also contact us with praises, suggestions for further editions of both the manual and the Qt Designer itself or any other things that you would like to comment on in the world of Qt.
If you hold a commercial Qt license you can of course use the support channels as well that have been assigned to you when you bought your license.