From my iPhone, I select the pic I want to send and send it to my email address. When I open up the email (MacBook )I press down on the pic with 2 fingers and hit download save.
To upload the pic on to the NGA site, I select upload an image, the downloads appear and I select choose.
The download will appear as several letters, than I select preview to see if that is what I wanted, than select finish.
You can also upload from the iPhone, I have NGA continuously logged on via firefox,
again select upload an image, your photo lib prompt will appear, select the photo lib prompt, select photo you wish to upload and than select done.