It's the same no matter what you are using. Get the URL of the image, which can be done by touching and holding the image, it will then ask you if you want to copy the image (For iOS 6), then tap the button on the screen when asking/editing a question and copy the URL into that. Once you have done this you just tap "Ok" and it will insert the image automatically.
I inserted the above sprite with my iPod. It isn't hard at all.