Working on the assumption that you have no clue on what to do, I've downloaded the readme file from their webpage. The first thing that you need to do as per the prerequisites is download kernel sources for you currently running kernel. In SUSE you can probably do this in YaST by doing a search for some variety of kernel, sources, or both. This will install an rpm containing you kernel sources should be installed into /usr/src/linux.
While we are on the topic of YaST, you probably also want to install the program make through YaST, since as I remember correctly, it doesn't come default installed in SUSE.
At this point you want to login as root in a console, and then use the cd command to change to user source linux.
Therein you should find several things. This is an example of my /usr/src/ directory.
lrwxrwxrwx 1 root src 19 2005-12-09 09:40 linux -> linux-source-2.6.12
drwxr-xr-x 19 root root 720 2005-12-05 16:14 linux-source-2.6.12
-rw-r--r-- 1 root root 40351758 2005-11-18 08:23 linux-source-2.6.12.tar.bz2
-rw-r--r-- 1 root root 96330 2005-09-30 09:11 ndiswrapper-source.tar.bz2
In this example,, my kernel sources are at linux-source-2.6.12, and there is a symbolic link linux that points to them. You may have to create this link manually. You would do this by executing a command as root (permissions),
ln -s <target> <link>
so I did ln -s linux-source-2.6.12 linux
At this point you should simply be ready to install. Unpack your driver, you can probably do this with Ark, or if you have to tar -xjvf <driver bundle>. Then, use the cd command to change your terminal into the unpacked driver bundle, and, still as root, execute their install script. It should be something like install or install_sh.
First make sure the script is executable, by doing
chmod u+x <install script>
and then execute it
Hopefully, this helps, or if I went into to much depth, I apologize if I condescended you.