Select your timezone from the list, and click forward
Choose your desktop. I'd recommend GNOME desktop if you have <b>less than</b> 512 MB RAM, and KDE 3.5 if you have more than that.
You will now be presented with the partitioning options. OpenSUSE "intelligently" offers to resize your windows partition and do everything automatically. I advise AGAINST using this option, and instead click Create Partition Setup