add/remove programs GUI? Am I missing something?

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http://www.kubuntuforums.net – I downloaded an Ubuntu/Debian package to install a screenwriting program named Trelby. I wanted to uninstall it and googled how to do it, figuring Trelby would have a command line way to do it. I didn't have any luck finding such a way to uninstall. However, some sites talked about an add/remove programs GUI available in Kubuntu from the Desktop. I didn't find it there. I also looked in Computer ==> System Settings, which is the logical place for it, IMO. I did not find it there either. I was finally able to uninstall it with the Muon Package Manager, something which surprised me (HowTos)