I'm not too good about YAST either, as I don't use SUSE. To install a RPM, you can usually use the command line, at least in RedHat/Fedora. The command is like "rpm -iv your_thing.rpm" usually (you have to be root of course).
However, I don't even know if this will work on SuSe and I don't know if you need any configuration to be do once the driver is installed... I suggest to browse google a bit about this, you are probably not the first one to try this