Well, hopefully you have better luck than me. I bought my card at a "clearance" sale online for $149.........I think i now know why the guy who who had it before me returned it. It doesn't overclock worth a darn! Oh well....only paid $149...have to look at the bright side.
Anyways, when you start the bios editor, you have to load up a bios file. I had the files already, becasue I downloaded them along with a "flashing" utility that allows you to flash the bios. If you don't have that utility, you're gonna need it. (try doing a search on the "Rage3d" forums)
When you get a bios file, load it, then change the speed to what you want. Click on "checksum", and then save it as a ".bin" file.
Then you have to go into to DOS and flash your BIOS with the new file.
All this might sound complicated, but it's really not. Once you have all the files you need, it's pretty easy.