How do you add transmission fluid to a 2000 volkswagon jetta vr6?

Is this an automatic or manual transmission? If its manual there should be a fill plug usually in the side of the transmission case. Just fill until it starts to come out the fill hole and re install the plug. If its an automatic, you need to run the car in park with the 5mm hex plug removed from the bottom of transmission pan. If there is fluid coming out while running (make sure car is up to operating temp), then it is full. If not, remove the red cap from the transmission ( easier to do with skid pan off, 4 17mm bolts hold in on I believe), then take out the plug and fill until it comes out of the hole that the 5mm plug was removed from. MAKE SURE YOU USE THE PROPER VW Transmission Fluid!