Some people remove unhatched eggs, others just leave them. Unless it is very hot, there’s not a great deal of danger. The egg won’t attract a predator unless it leaks or gets broken or explodes (and there are various opinions about whether hot eggs actually explode or not). I’ve sometimes left unhatched eggs in the nest, and never had an issue. If it should crack or show signs of being broken, then you might want to remove it. The adults might take care of it themselves, anyway – either removing it, or pushing it out of the nest into the bottom of the box.
As for posting pictures, you have to use the url for the image itself, not the album page it’s on. I fixed it for you this time. Look at the instructions in the Posting Guidelines sticky thread for more info.