how do i unlock a p3?

ok this is my first time overclocking, i get into the bios but i dont know where to go, im just testing this on my older p3 533mhz, 128 ram, i dont think ill be doing anything extreme just maybe like an extra 33 or 66 mhz or so, any help would be nice

There's no unlocking to do in an Intel CPU after the earliest Pentium IIs. The only way to overclock is on the Front side bus. You have a 533, so the front side bus is 133 MHz. More likely than not, you will do this by going into the BIOS, and changing the CPU or front side bus clock from 133 to a higher figure; these will vary depending on which motherboard you have. BTW, what do you have, anyway?

not sure on mobo

this one was store bought , this oc is more of a test, brb gonna go try something