Your manual should indicate whether you have the ability to change multis or not, and whether you can do it through the BIOS or a jumper. Odds are, though, that you don't have that option at all. Since I don't really know your board, that is about all I can offer.
In looking at the manual, I don't even see an option for you to change the FSB. This does not look like much of an overclocker friendly BIOS.