I installed fedora core5 from a dvd. I did not select the custom packages at the time of installation. Now i want to install KDE Desktop. How can i install more packages from the dvd. Add/ remove software does not open. It shows an error message like access denied.

i just read sumwhere that i have to change sumthing repositries. i read that when you open add/remove package then by default it tries to connect to the net. I have to change that path. i have to provide the path of the dvd in the place of that internet adress. That i don't know how.
Plz help. i dun kno anything about linux. I am new

Nothing is stopping you from installing the KDE desktop from the DVD as root from where the rpm files are on the DVD type something like;

rpm -Uvh kdebase-3*.rpm kdelibs-3*.rpm arts-1*.rpm qt*.rpm

This is helpful also; http://fedora.redhat.com/docs/yum/en/

Installing and using createrepo will help also, you can create a local yum repo for the DVD to install/remove packages. http://linux.duke.edu/projects/metadata/