No need to worry about kwifimanager or iwconfig at this point until you install the drivers for your card.
To do that with yast you will need to add some add sources to YaST. Here is how it works. Yast is your package manager. It will only install what it knows about. If none of its sources have madwifi it can't install it. I would start from the beginning of the guide and do each step. There are no shortcuts or just getting lucky. It is a process.
OpenSuse is missing alot of stuff you will need to install first. They want you to get frustrated and buy their enterprise edition.(my opinion)
Here is another guide;
hope this helps and post back. You will get it working....