To install a package you can
locate the package you wish to install in Konqueror, drag it onto a running copy of KPackage
click on a package file in Konqueror and start a new copy of KPackage
use on the Open menu items in KPackage
selecting an available package in the package tree
For a selected package, use the buttons in the right panel, the Fetch button will fetch the package from a remote source and display detailed information, the Install button pops up the installation window.
For marked packages, use the button in the left panel, the Install Marked button pops up the install window.
The install window lists the packages to be installed and allows the setting of install options. The panel on the right is an integrated terminal window in which the installation programs are run, for interactive installation programs the interaction is done in this window.
RPM packages are handled slightly differently from other package types, since the installation is done directly by KPackage , the right panel is only used for error messages.