How do I Install graphic drivers for a radeon xpress200?

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http://askubuntu.com – I downloaded the drivers from here http://support.amd.com/us/gpudownload/linux/Legacy/Pages/radeon_linux.as... but I can't figure out how to install them. I have a monitor with a resolution of 1440x900 and I'm trying to get the correct resolution to show up. When I go to display settings only 1024x768 and 800x600 show up in the options. I'm very new to Linux and am liking it so far, but this is the only problem I'm having...any help would be appreciated! (HowTos)