can somebody explain to me about this form who have to fill up
thanks

The DS-3032 is also known as the "choice of agent" form. It tells the NVC whom you choose to receive your mail. They do this because it takes a long time for the foreign spouse to receive mail. So, typically the foreign spouse chooses their USC spouse (or their attorney) to receive mail on their behalf from the NVC.

Please fill in your timeline and also check out the National Visa Center forum here on VJ. There are several very nice guides which will help you through this stage.

Good luck!