I went to angelfire.com and set up a free webpage they offer. All you do is fill out the contact info, make a a username(this will be your address) and a password. When you go to your webpage to begin work, it will be completely blank(called a shell). Look around on the screen for something says "upload" or "file upload". Upload your pic(may take a couple of minutes). Once it loads, If you look around you will have the option to view your pic on the website. Choose this, and on the next screen(you will see your pic), copy the URL and paste it into the image URL at the bottom of your KS post screen. I hope that was not totally confusing.
Also, Lele described how to do it another way a few posts down, and it seemed pretty straightforward
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Matt