I generally stay away from the GUI package managers... every one of them seems to have some little quirk to it and I don't wanna play around when it comes to this stuff.
Here's a run-down of the common commands:
rpm -ivh <package.rpm>
rpm -Uvh <package.rpm>
To list all packages:
To search for a package on your system:
rpm -qa | grep <search string>
To list all the files in an installed package:
rpm -ql <package-name>
To find out what package installed a file on your machine:
rpm -qf <filename with path>
To get information about an installed package:
rpm -qi <package-name>
Hope that helps.