When in your profile you should see the latest photos you uploaded, in the strip area, which is called “photo_bar” in the page code. When hovering the photos, there’s an X sign. Clicking on it removes the photo. Problem is, instead of seeing a new photo, you’ll just see a grey box.
To add photos that will appear instead of the grey boxes just go to the photo you want to add, and TAG it. You’ll see the “Tag This Photo” option, on the bottom left, when enlarging a photo.