best and easiest way is to get a free account at a third party picture storage site, like photobucket or flikr and upload your photos to there. Once you have done that, your pictures will have links associated to them for board posting once inserted into your post, will come out like this:
Easy as pie really and likely the best way to post pics online.
EDIT
Ok, so it doesn't look like the editor will allow me to show you the "link" without it actually posting the picture, which is really lame. I tried to help, but the limitation of the board won't allow me to help you fully.