MB PC100 Bxcel M726MRT overclocking

[Fred C.]

Hi everybody, sorry for eventual misakes I shall certainly commit.
Since I live in Czech Republic and Internet is quite expensive,
I have to be fast and therefore the errors are inevitable.
What's the problem?
I have PC100 B xcel (M726MRT) MB with Celeron 333 and want to overclock it. So far the PCU resisted to my efforts in changing switches on MB and there is nothing regarding that in BIOS either.
I've bought the MB second hand, so I don't have any booklet on it.
Can anybody help me please?
Fred C.