I can get it to upload, but it's too big and cuts off the image. Tomorrow when I'm on a real computer instead of my iPad, I'll resize it and make it work!
ETA: Well, I've done everything I can think of. Uploaded directly from my computer, resized it, cropped it into a square, made the file size smaller, linked to the smaller image on my photobucket... Nothing has worked. I'll get in touch with tech support and see if they can fix it.