Here's the simplest way I have found from scratch. Go to
http://www.jpgbox.com/ , click on upload image, a box will give the "browse" option, so choose that and point it to your storage folder that you have the image in on your hd. Now, just click the file name, go to the bottom of the JPG BOX page, and click the "upload image" button. When the upload is finished, your image will be on the JPGBOX page and under that pic, will be a address box for "bulletin board" posting, copy that address and paste it right in your post that you are typing. I always use and extra line between my post and the address both top an bottom.
With JPGBOX, you don't have to join, and there are no extra steps necessary than what I have explained...good luck.
binko
