Sorry, I forgot to check back and see if you'd posted back!!!!
What you're going to need is the URL of the image, so either an image that is already online or an image that you've uploaded to photobucket or some other photo host. Where it says "URL" you would need the url to your photobucket image.
You highlight the whole URL starting with http and ending with jpg, then right click and select "copy". Then click into the box on the upload form that says URL and right click again, this time selecting Paste. The URL should end up in the box. When you click into the next box a preview of the URL pic should show up. Then type a description, in this case "ring pull egg", and a title if you want, like "Nifty idea!". Then click "insert". Hope this helps!