take out light bulb in a dash
Take it to Auto Zone or Discount Auto Parts, they'll do it for free if you buy the bulb there.
ATF-III
Take it to a mechanic!
The Isuzu has a sealed transmission. It has a transmission fill plug on the side of the transmission above the pan, I believe on the right side of the trans case about midway the case body. Take the pan off remove and change filter. Add fluid by using an inexpensive pump until the fluid starts to run out the fill plug hole. Replace the plug. Job done.
When changing the filter and fluids of a car, it is important to know the fluid capacity. A 2000 Isuzu Trooper uses 9.1 quarts of transmission fluid.
take it to a transmission shop
there isn't one you have to take it to transmission shop and have them chek it for you
Take the dipstick out ues a funnel and put it in through the dipstick hole!
Trannythese Isuzu transmissions take dextron III with mercron
If it's auto it's DEX III, manual is 5 W 30
Dexron III