Where do I add transmission fluid to a 2002 PT Cruiser?

Try to add LUCAS OIL transmission anti-slipp additive. It helps smooth the shifting. If this helps you need to replace transmission fluid with the filter and add fresh fluid with Lucas oil additive ..

I would go by the hot reading of the cars transmission fluid. Check while in park and idling, check as you stated on level ground. Wait until the car temperature reaches normal operating temperature then check the fluid, not once but at least two, even three times to make sure your reading is accurate. If it shows a cold reading still then add fluid until it is within the hot reading area/marks. NOTE: be aware that when it says hot meaning the fluid in the transmission is hot, not just the cars motor. So you may want to drive it around to warm it up then come back and park it on a level surface and leave it running. Wait 5 mins or so then go out and check the fluid, again it should read between the hot marks if not, add until it does. Hope this clarifies the proper way to check your transmission fluid.

Should be a rubber plug on the left side just above the axle shaft.

get a service manual from auto zone this will help you

Usually replace spark plugs some require distributor cap and rotor and wires oil and filter transmission service timing belt replace air and fuel filters change coolant and brake fluid and a cabin filter if required in your car

Not transmission fluid. Just plain power steering fluid. Any brand will work. OK?

the 2nd & 3rd gear solenoid needs replacing. It is mounted by the trans filter inside the trans pan

Use only Mopar ATF+4 Do not use any substitute or other fluid that claims to be a replacement.

through the tube is measured where the oil level

I assume u found the dipstick to check the fluid level? Use a funnel to add fluid at the dipstick tube, slowly, while engine is running. Shift thru the gears several times, recheck level, don't overfill.