Just bought a 2003 Jetta Glx Vr6, were can i check or fill the transmission fluid?

It's a 5 speed tictronic transmission, so I figured there would be a fill cap or at least a fluid level dip stick like on most automatics. Check engine light is on and the code(P0732) says that it could be 1. poor electrical connection 2. low trannsmission fluid level 3. failed transmission solenoid.... revs super high in first and shifts rough when cold, once warmed up runs much better, i'm hoping its just low fluid. Any help or advice would be appreciated. Thanks.