How to bleed the clutch

SOURCE: clutch pedal stays down

Still have air in system.. Try this: Pull pedal up,fill reservoir to the top, open bleed nipple on slave cyl all the way,leave for a while to "gravity feed" keeping the reservoir full,& an eye on the nipple, until all bubbles are expelled and clean brakefluid drips out(could take a few minutes). Close the nipple, and bleed system as usual....

SOURCE: The clutch on my car

Bleeding the clutch is similar to bleeding brakes. You'd pump the clutch pedal several times to get the pressure up, and then open the bleeder on the slave cylinder (mounted down on the transmission). Repeat and add fluid as needed until no air comes out.

Two things - first off, some cars have more than one bleed point (the Nissan 300ZX is one of those), so be sure there is only the slave cylinder to bleed. Second, if it went right to the floor, something failed - either the slave cylinder or the master cylinder. Changing the slave is relatively easy - usually two bolts and it comes off, you put on a new one, and bleed it as described above. Often the slave cylinder is less than $30, so it's worth it to try changing it if you can't get the pedal to come back off the floor on its own. A clutch master is significantly more expensive and more difficult to change, so start cheap and easy and replace the slave cylinder if you can't pump the pedal to get pressure built up for a bleed.

SOURCE: 1996 Ford Ranger XLT Clutch Bleeding

The problem is up at the Master Cyl............It comes ou of the firewall and points DOWN at about a 45 deg angle.....The reservoir is remote and the hose is set to the lowest point of the cyl...........The tube TO the slave is 180 deg around facing bottom...........
Take the master cly OFF the firewall.......tilt it so that both inlet and outlet are the HIGHEST point of the cyl........Gravity bleed or vacula the slave.........then reinstall the master
I know it sounds like a lot of work but it's the easiest way to clear the air out of Ranger/Explorer hydraulics

SOURCE: Bleeding clutch slave cylinder

if you loosten the slave bleeder screw and push in the clutch pedal fluid should come out if not make sure someone holds down the pedal and tighten the screw then pump the clutch a few times and hold the pedal and open the screw if no fluid repeat a couple of times if still no fluid you need either a new master cylinder or just rebuild it( normally cheaper) and if you rebuild it make sure you flush all the lines of debris

SOURCE: Help,

You have to pre bleed the master cylinder or it will never work. Parts stores sell a tubing kit for this job. essentailly a hose goes from the output to the fluid reservior. Your clutch pedal sounds like it has spring assist. so you need to manually pull it back... It may be easier to pull the cylinder and bench bleed....

anyways, do not let fuid run low while bleeding the rest of the system.