Overclock SFX Snes Emulator and RGUI question

My first question is how do I change the clock rate of the sfx chip in the snes9x next core? I see that squarepusher said in another thread to use the rgui but I honestly don’t even know how to use the rgui to do that. I can’t for the life of me figure it out.

Edit: I figured it out. For some reason when i would try to download the new snes9x next core out of retroarch it wasn’t replacing my old one. I was able to just delete my old core and then download it and the option showed up in the rgui after that.