How bleed 1994 clutch slave unit

SOURCE: Wrangler 2000 clutch

the slave cylinder needs to be level. get a small bubble level and jack up the front or rear appropriately till its level.

SOURCE: clutch not disengageing on 1996 jeep cherokee

There has to be a bleeder there unless someone broke it off. If so, your best option is to replace it. In order to be malfunctioning, there has to be a reason. Air just does not enter the system by itself... Either the clutch master, slave cyl or a line between the two is bad, or the clutch itself is worn. Check everything carefully before deciding upon a repair plan.

SOURCE: 1990 jeep wranger slave cyclinder

The clutch slave cylinder on this model is located inside the transmission bell housing. You would have to pull the tranny to see it.
Bleeding the slave cylinder is a fairly simple process.
Underneath the vehicle on the driver side you will see two hydraulic lines going into the transmission where the tranny connects to the engine. If you have trouble locating just follow the hydraulic line from the master cylinder on the firewall.
One of these lines is actually sticking out of the tranny and has a bleeder valve on the end.
You will need a 9/16 box end wrench and a 5/16 or 1/4 inch box end wrench and someone with you to press the clutch pedal while you are under the vehicle.

1. Top off the master cylinder with clean brake fluid. Also, MAKE SURE you keep the fluid level in the master cylinder topped off during this process. You may need to have a second helper to take care of this so you don't have to keep climbing out from underneath.

2.Hold the line with the 9/16 and loosen the bleeder valve a couple turns or until fluid begins to drain. Have someone SLOWLY depress the clutch pedal to the floor and hold it down to the floor until you tighten the bleeder valve back up. MAKE SURE YOU ARE OUT OF THE WAY OF THE SQUIRTING FLUID WHEN THE PEDAL IS DEPRESSED!!

3. Once you are sure the valve is tight, have them pump the clutch pedal a couple times . Repeat step two until the pedal has a full stroke.

SOURCE: 1990 wrangler all new slave cylinder, pressure

If you have had the flywheel cut, have a clutch with a different release height (different finger or diaphram design & height) or a remanufactured pressure plate, or all of the above, you may run into this problem.
Small differences there translate to a large difference at the pedal. On linkage type designs, there were several options including longer/shorter throwout bearing or adjustable fork pivot ball. Hydraulic systems should compensate somewhat, but if you are beyond the travel of the slave cyl, I'm not sure there is anything you can do from the outside. I would check that there are no air leaks. If you have an external slave cylinder you may be able to make a slightly longer rod that connects the slave to the clutch fork. I really can't think of anything else to do at this point.
Hope this helps a bit.

SOURCE: HOW TO BLEED CLUTCH NEW SLAVE CYLINDER

hook vacuum pump,cheap at auto parts store, to zert type fitting, on slave cylinder,open,  vacuum out old fluid, keep eye on reservoir, maintain fluid level when re tighten