This could probably go in hardware, but never mind.
Check the graphics card outputs available, either by physically looking or on the manufacturer's site.
Then all you need to do is plug the monitors in.
Your graphics card may not have the right outputs fr your monitors though, which is why I advise checking.
You also need to use the Catalyst Control Centre, or whatever else you may use, to enable dual screens.
Having an ATI card and dual screens myself, I am somewhat familiar with the process, so if I haven't explained it well or you need more help don't hesitate to ask.
