Oh sorry..(한국말로) ----을/를 어떻게 말해요? Is perfect.
을should be said when the last letter of ----has a 받침(final consonant)
를should be said when the last letter of ----dones't have a 받침.
How do you say meat in korean?
한국말로 고기를 어떻게 말해요? (고기 doesn't have a 받침, so 를 is put)
How do you say person in korean?
한국말로 사람을 어떻게 말해요?(사람 has a 받침 ㅁ, so 을 is put)
I hope it woll help you..:)