I adjusted mine when I got it, because whoever last adjusted my clutch obviously forgot to adjust the cable, undo the first bolt, and then the second bolt will move, adjust it to your personal preference, but as mentioned by saxova, the clutch pedal should sit same height as the brake pedal
And another thing, be careful after, I didn't realise how much the biting point had moved and stalled the car first time! Embarrassing lol