Okay, time to display some (more) ignorance. When I insert an image into a forum post I click the 'insert image' button in the editor, and enter a full URL to the image in the 'image info' tab. The image itself is held on my web host. All that works fine... except that the image appears full size in the post, which can throw the page formatting off.

Almost everyone else seems to have a smaller sized image in their posts, which when clicked shows the full size image. The URL for that link is a renderosity URL rather than an offsite one, and always looks something like "http://www.renderosity.com/mod/forumpro/media/folder_9/some_file.jpg". I want to use this same resized image arrangement. How is it done? I've searched on this site and can't find it anywhere. I'm clearly missing something obvious.

Help would be gratefully received.

Steve