CCC (Catalyst Control Centre) is the software for AMD graphics cards, you can download the latest version here. You have a version of it installed on your system already, double click on the icon on the bottom right of your Windows taskbar to open it up. It should be pretty obvious how to extend onto another monitor or duplicate monitors or a quick google will tell you how. None of this has anything to do with Eyefinity (which is one big desktop over several monitors) so don't try to create an Eyefinity group. You just need to extend and duplicate monitors.