how to change audio language

i just wonder why no such hints in the official website or here, they should list some basic technique for ppl.

so how can i change the audio language? for an example, i play it in CHT, but want audio is chinese as well, not english. why they don't have an option for ppl to change it in the game. i know we can set it in parameter on EA app, but u dont know what parameter should be used.