Open the GUI package manager (System / Configuration / Packaging / Install, Remove & Update Software).
Enter 'nvidia' (no quotes) in the Find: text entry field near the top of the window and click the 'Search' button.
You should get a listing of the available nvidia driver packages. There will be a nvidia package and a dkms-nvidia package for each version. I have three versions listed here, the most current (9631), the next newest (8774), and the legacy drivers (7184).
If you have to have the absolute latest drivers (9746), you can get them from the nVidia driver archive
Click the link for the appropriate driver for your system.
Follow the directions on the resulting page.
I have an old nvidia card here which is no longer supported in the new driver releases, so I use the legacy drivers from plf.