Problem installing packages outside Fedora 19 repositories

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http://forums.fedoraforum.org – I just made the switch from fedora 17 to the Fedora 19 KDE spin (I've never used KDE on any Linux distro until now after ditching Gnome) and when I try to install rpm packages from the internet Apper asks me if I want to install the unsigned packages and after hitting yes it shows the additioonal packages that will be installed and hitting continue Apper singles out the package that is listed as untrusted and when I hit continue again an error message pops up saying that I have not provided the authentication needed to install the application but when I install packages from the Fedora 19 repo (HowTos)