You're not the first person to have difficulty finding the tranny dipstick, which is not even mentioned in the owner's manual. It is on the very front of the transmission, near the lower radiator hose. It's yellow, and you have to push a little clip on the stick to remove it. I think it is easiest to see when you are standing on the driver's side of the vehicle. The distance between the two marks on the stick are only 0.2L apart. Overfilling will cause foaming of the ATF, and can apparently be as harmful as underfilling. It is best to measure the level with the tranny hot (as in after a brisk drive on the highway) and with the engine running, so wear gloves and long sleeves to protect from burns. At least there's no moving parts nearby.