Unscrew the drain bolt under the transmission oil sump/pan, it’s a size 14 bolt.
Don't understand why the ATF drain bolt is not located at the lowest point of the sump, how to fully drain the old fluid on the sump? The only explanation I can think of is IF the bolt were lost, not all fluid "escape" so gearbox may survive.. I had to lift the front right wheel using the jack until maximum the jack can provide.. to tilt the pan to try get as much of the old fluid out. Next time can consider siphon technique, releasing from drain bolt doesn't get rid of old lube as well as siphon technique since the siphon tube can reach the bottom of the pan.
Only about 2L is drained..
I bought the drain bolt washer from the authorised service centre, the metal o-rings are for the rear diff, one each for drain and refill screw. The “paper” type is the same as engine oil drain bolt gasket, meant for transmission drain bolt. Didn’t get to use though because lazy to remove the old gasket. Very tightly stuck onto the ATF pan.
For refill, I joined some larger diameter straws, to be exact, 3 of them together using salophen tape to pipe the fresh ATF in.
I bought extra ATF but seriously, 3L is more than sufficient.
Check out the DIY funnel.. heh! liquid medicine measurement cup for the kid + silicon sealant nozzle, hot glued together..