its in the engine bay under the battery tray. you see a swing arm attached to the top of the gearbox, that's what the cable pulls on. the end of the cable is a bracket with a thumbscrew adjuster.
simply oil the thread abit, loosen the small locknut, turn the thumbscrew to adjust bite point: clockwise tightens cable to raise bite point, anti-clock loosens cable to lower bite point, then tighten the locknut to set.