I email it to myself and rotate it in the default Windows photo viewing program and then save it and upload that. Im sure you could also just try rotating it on your phone, but for me it looks right side up (on my phone) until I email and download it on my computer.
It's a bug with the software that I process photos with combined with how iOS devices are saving orientation information. I forget, but I think if you actually edit it on the iPad and rotate it, save, then rotate it back, and save.... I think that fixes it.
One of these days, I'll have the time to fix that bug. It affects all the general Guest Album photos too, unfortunately.