KRssFeed is (afaik) the only GUI RSS creator for KDE, it has a simple interface, and it implements a simple text editor, so you can add new tags, and fix any mistakes you may have made easier. It is now possible to save.
12 years ago
v0.3.3: Very minor update, layout was broken again, i advise everyone to update.
v0.3.2: Implemented webMaster tag.
v0.3.1: Fixed bug in the interface when resizing. Added seperate save button
v0.3: implemented saving
v0.2.1: Fixed huge bugs caused by v0.2.
v0.2: New interface limitations lifted
v0.1: First version