Good size images! I find this is easy to follow, for any image on any site, including this one:
Once your photos are on a photo hosting site (such as Imgur.com; Photobucket; Dropbox, etc.), select the full image, then Control-click (Mac) or Right-click (Windows) and choose copy image location. Now paste that URL (the full web address) into the box that pops up under IMG in the compose reply window of the thread in which you want the photo to show.
