Automatic transmission fluid level

Where do you check the automatic transmission fluid level on a Volkswagen Golf 4 with a 77 kW engine and a 5-speed Tiptronic transmission? And where do you add more if necessary?
I probably made a mistake . I wanted to change the engine oil and grabbed the wrong screw (a 27mm hex bolt, straight down from underneath, the only one that was easily accessible). In any case, what came out wasn't black engine oil, but a reddish-brown, verschandeln oil. I didn't move the vehicle as a precaution.
Please respond quickly; I need the car back soon.
Thank you in advance.
Martin.

hi,
In addition, the ATF oil temperature must also be measured using a diagnostic device.
You should have it done by a mechanic.
greetings

'Thanks, it's been resolved. The mechanic at the gas station showed me the fuel filler opening. I just put everything back in, and that's it. There was a loss of about 5 ml, but that's not significant.'