Posting pictures to instagram?

I have a Nikon camera and I want to know how to get them from my camera to instagram

There's no specific way, but I just upload the pictures from my camera to my computer, email them to myself, check my email on my phone, save them, and then upload them to Instagram. A bit of work, but obviously a Nikon captures better shots than a smartphone!

Instagram is through Apple and now available on Android phones, so the best bet is uploading your pictures from your camera to your phone and then posting them to Instagram from your account. Hopefully you have an Instagram compatible phone to do so.

I think it's more of an App, so you install it on the device and take photos/edit through the app

Email them to your phone then upload them.