sometimes you want to share your Instagram post on whatsapp to some of your friend. it s soo easy..
open your Instagram post and click on top right option like this
click on option "Share on WhatsApp" like this
it will open up your Whatsapp and you can search your specific name like this
now you will select any contact from whatsapp and click on send icon like this
now it will open your picture in edit mode so that you can edit your picture according to your specifications like this and then click on send icon
now you can see your sent picture like this in inbox...