You can just use the Nikon PictureProject software (if you don't have anything better installed on your PC) and resize accordingly.
I think file size needs to be < 60kB or something. Quite small.
There is a requirement on the resolution of the image (width and height).
Check the ica requirement as suggested. Use any software to crop it.
IMO, would be easier if you need a print out copy, just use those ID photo sations located at a lot of places to do the work, easy and clear, definately meet the requirement.
If you need a soft copy, just scan the ID photo you got.