There’s a new ‘visual guide’ to inserting images in forum posts [PDF] in the Downloads/Resources area. (You’ll find it in the ‘4 Miscellaneous’ section.) The guide shows screen shots of the simplified steps for inserting images.
Members can store image files in their gallery here on the CPS site. Or you can use a storage site like ImageShack or Flickr. At the end of the guide, there’s information about how to get the URL for your image file from each of these different storage locations.