Automatic transmission oil change

Hello , with me soon there is a big inspection to which I carry out with my buddy , I still have to order the oils , well yes a question I have to you ,how change I the automatic transmission oil , have indeed 2 mates who know of the , and a friend has ne Amiwerkstatt , but wanted to make use of it already here and ask you times !!! Is this an oil pan like the engine or how , 6 liters have to go in there according to the workshop and where is the automatic Gerie oil filter ?! And how does the then by ?! want to do nothing wrong !!! vlg Juliaaaan thank you already 😉