How do you fill transmission fluid on 1990 jeep wrangler

There should be a plug on the bottom of the transmission to drain and a plug on the side to fill it.
No spark could be a relay or the coil among other things. You may need a shop manual and wiring diagram to troubleshoot the ignition system.

Automatic Transmission, 32RH Initial Fill..........4.1 quarts
Automatic Transmission, 30RH Initial Fill..........4.1 quarts
Automatic Transmission, Total Fill
3 speed 32RH..........8.6 quarts
3 speed 30RH..........7 quarts
Manual Transmission, AX-5 2WD..........7.4 pints
Manual Transmission, AX-15 2WD..........6.8 pints
Manual Transmission, AX-15 4WD..........6.8 pints

Here is a diagram with the fill plug location.
Fill Plug Location

Transmission generally takes a bit less than two quarts, Use 75/90 gear lube in that (in very cold climates you can add a small amount of automatic trans fluid to keep it flowing on cold starts) Transfer case takes a bit over one quart and takes dextron mercon 3. When filling either, fluid is full when on a level surface it begins to come out of the fill hole while filling. When changing either, always make sure you can open the fill plug before draining so you know you can replace what you removed.

It should be under the hood towards the leftside of the motor.Thanks you for asking and I hope it helps.Please leave me a 4 thumbs up.

Most 90 wranglers from 89 to 95 have an ax15 5 speed transmission in them. The 4 cylinders had an ax5 transmission.

Sound like your clutch master cylinder has developed a internal leak or maybe even leaking out the back past the seals. Have you checked the brake fluid level in the clutch master cylinder resorvoir it may be low and you have air in the system. Either way you have a leak somwhere in the system and you need to determine where it is. Fill your resorvoir with approved fluid and while some one is pumping your clutch pedal see if you can see where the fluid is leaking from the jeep. Reair or replace as necessary.
good Luck

check passenger side of transmission - it is a 3/8 ext that will fit the bolt - does not really look like a regular fill hole -

The clutchless shifting doesn't help your cause any. Has the fluid been changed yet? Start with fresh fluid and go from there.

the plug of the transmission of 1992 jeep is under the transmission case .