Did you know that you can upload pictures from your facebook, myspace, your favorite supply shop, reddit or any other random site on the internet?

Pull up the picture you want to post. Right click on it to bring up the 'secret menu' (that's how I had to explain it to my mom :P).

Choose either to "Copy Image URL" or to "Open Image in New Tab". (if you open the image in a new tab, you have to go to that tab to copy the URL from there).
Click image for larger version. 

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Now, just click on the "Insert Image" icon in the message board you are trying to post in, and paste the URL in there. DONE!