Launch Camera Plus. Next, Go to the Camera Roll.
Now select the photo you want to share.
On the Photo preview screen, tap the Share button present in Navigation bar.
Once you tap on the Instagram Share button, a crop page will come up.
Now you can either crop your image or pinch out the photo to share the entire image.
Select 'Open image in Instagram'.
You can also edit the image as per your wish and then tap on 'Next'
Finally, you can share the entire image to Instagram.
The creator of this guide has not included tools