You bleed the clutch system just as you would bleed the brake system of the vehicle. First check fluid level in the clutch master cylinder. Replace and tighten the cap. Have your assistant pump the clutch pedal several times to build pressure and have them hold presuure on the clutch pedal as you open the bleeder on the clutch slave cylinder, have them continue holding pedal down until you close the bleeder and tell them it is ok to release the pedal. Repeat the process until there is no more air in the system. I would suggest rechecking the fluid level every couple of attempts, if the master cylinder runs out of fluid it will push air back into the system, aggravating the problem. Also use a catch pan under the vehicle to catch expelled fluid.