I have found it easist to open a free account at Superford.org. They will let you host your pics for free. Once they are loaded in Superford they will have the exact url for the pics. You just copy the url from that site and paste it here. They will already have the
I use www.superford.org and I also have an account with www.walagata.com. I would suggest superford.org only because they let you have all the pcitures you want (car related). I use walagata to host the pictures of things I make in Photoshop (my sig.) But just thought I would throw that in....