Click on the camera. Should open, the photos uploaded to your gallery, and three buttons below that. Middle button is upload a file. On my iPad that gets me to my photo folder, and then I can go to the gallery, I keep all the truck photos in, Pandora pick the photo. That gives my an option near the bottom to select size. typically I use medium, to get below the size limits.
I don't have to save them on the site first. I use a Macbook and I do have to save them outside of the iPhoto application on my desktop before I upload. But using the method i describe above i have found to be the simplest method.