Hmm.....should be marked clearly and the CPU ratio thing should be automatic. Oh well...lets see. You first have to determine your FSB. I assume you have a 266 FSB processor (as opposed to a 200). In that case, simply divide 800 by 266, which is about 3. So set it for 3.
You should have a small area on the board with litle pins sticking out with marings like HDD, PW, RESET, and the such. If you cant find it, it willbe in the manual. No, let me see if I can show you with paint: