A dialog between two persons, John and Mike, Mike is not a native a speaker:
M: John, look at this sentence, should I place commas here and here?
J: Yes, place them.
J: Yes, use them.
As I see it, "use them" is a correct sentence, but I'm not sure about "place them". Is it necessary to specify the placement, either explicitly, like
J: Yes, you are right: place them before "but" and before "and".
J: Yes, place them exactly this way.