I am a Nepalese citizen currently residing in South Korea. I am travelling from South Korea -> USA -> Argentina and Argentina -> USA -> South Korea. I have some confusions filling up DS-160 form.

1. In Travel Information Section of DS-160, I couldn't find any fields where I can fill up round trip information. Do I need to fill up two DS-160 form for round trip.
2. In Travel Information Section of DS-160, I have to fill up information about "Address where you will stay in the US". Since I am only transiting how can I provide these information?

Thanks in advance.