You should read about overclocking listed next to every EMU here, its not really Overclocking, the PSP comes made to run @ 333mhz. Sony clocked it down to improve battery life. You will not damage anything on the system because it is currently underclocked. Just look at the Need to know Info you will see the explanation as well. Your fine using 333mhz. I use it all the time.
However to change the speed in UO SNES push the Thumb Stick Left and the last option before the Rom's List shows the processor speed pushing left or right changes the speed setting.
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