If it's like previous VW Aisin transmission's its a bottom fill, kind of a PITA. Need the correct fitting. You pull the drain plug and then pull the inner tube, drain, re-install inner reach tube, bottom fill by overfilling. Re-install drain plug, run to temperature and run through all gears a few times, remove drain plug until fluid has a fast drip. Re-install drain plug. Used to be Toyota WS-4 or equivalent.