How to update Redhat 7.2 using up2date?

Hello I’m hoping someone will be able to help me with this, My problem is I installed RH 7.2 but it does not support my Radeon 7500 agp card, so all i get is a command line at boot. I did login and ran up2date, which in turn had me register and download the public key. Now that I have the key I’m not sure as how to download the rpms, if anyone knows more in detail how to do this it would be greatly appreciated. I believe the updates will have support for my card, unfortunately I’m completely new to redhat so I’m kind of dumb. Thanks Dean