I finally tried to figure out how to resize photos to put in the gallery, but one of the few I've mananged to upload is really small. I used shrinkimages.com and figured out I can make it bigger, but how do you edit once it's uploaded?

Unfortunately, you can't edit a photo that's been uploaded on CC. You'll need to go back to your original and try resizing it again, but this time do it a bit bigger.

HTH!