If they are hosted then just right click the image and click "properties" that will bring up a little box with the url of the photo. highlight and copy the url and then come here and click on the little yellow button that looks like a picture of mountains and past the url into the dialog box that pops up.
"But it does me no injury for my neighbour to say there are twenty gods, or no god. It neither picks my pocket nor breaks my leg." - Thomas Jefferson, Notes on the State of Virginia, 1782
Arguing with a truck driver is like wrestling with a pig in mud, eventually you realize the pig enjoys it.
You can also go to tinypics.com, select the size you want (message board) hit the browse button and it will let you select pics directly from your computer rather than having to use a hosting site. Hit upload now. when the urls come up highlite the one for forums and message boards right click the mouse and select copy. Come here and paste. Easier than it sounds.