To change the transmission fluid, you first drain the old fluid by removing the large bolt to the left hand side of the transmission, after it is drained you may place the bolt back on. Add the new fluid under the hood of the car, where you check the transmission fluid at.
Kia Rio manual trans fluid change Change the manual transmission fluid, first remove drain pulg on the lower bottom of the transmission. Drain old fluid. Reinstall drain plug. Remove the speed cable housing from the transmission, this is where you add the new fluid.
The 2001 Rodeo has a sealed transmission. The only way to change it is to pump out the old fluid and refill it via the route. This is not for the weekend mechanic and I suggest that you have a dealer do it.