Can't o/c my p4p800...

When i go into the BIOS and jumperfree thingy and after i set it to manual i get this:

looks fine right?
but whenever i try to change the FSB thingy (where it says 200), i can't! nothing happens if i press enter or anything like that...
Help please!
Ritalin

problem solved, had to use + and - on num pads... thx neowin boards