From what I seen on your other post, you've got the right idea. The site that you're linking to does allow remote linking, so that is why you're get the big red x. The site that I use is www.imagestation.com
It's free and very easy to use. Once you get your photos downloaded on there, just come back here and do the same thing you did in your other post. It should work. If not, just get a hold of me and I can talk you through it. It sounds much harder than it really is!
Good luck and can't wait to see those pictures!