first you need to take your case apart and make sure there is a fan on your cpu heatsink. Then look for jumpers. http://images.google.com/imgres?imgu...l%3Den%26lr%3D
there will be a number next to each jumper like jp2 or jp3 or bs2. there should be a diagram somewhere on the motherboard that shows which pins the jumper should be on for whatever option your trying to change.
here for example; j7e1 jumper with the pin count as 3,2,1 left to right. So if the diagram showed
133mhz then you would put it on pins 2 and 3 as shown in the picture for 133fsb which would run your cpu at 465.5.
To overclock using the bios, just enter bios (delete,or f1,or esc key) as it boots, I mean you gotta start hitting them right as you poweron. look for a fsb setting, or a multiplier setting. And if you ever change a bios setting then CAN'T GET BACK INTO BIOS, there should be a jumper to reset bios as well. Or you could pull the battery for a few minutes to reset it. It's flat circular and slightly smaller than a quarter. good luck
p.s. it's very possible that you have no fsb jumpers or bios options, **** happens sometimes. If that's the case then your stuck.