You can't check the transmission fluid on this vehicle because the transmission is factory sealed. There is no check plug at all. If you detect no signs of leakage assume everything is okay.
If you still wish to service it some shops (Kwik Kar) use a fluid changing system that places fittings on the fluid lines going to and from the radiator. Once installed and connected the pump in the transmission pushes the old fluid out into a chamber which has new fluid at the top and a " hocky puck" piston in the middle to separate the old and new fluid. As the pump pressure forces the piston up new fluid flows back into the transmission.
While not as good as being able to drain and refill as you are used to it does get some new fluid into the system.