It is preferred that you use http://tinypic.com
for inserting your pictures in your post rather than an alternate method of including pictures as an "attachment". TinyPic allows you to upload your pictures and obtain a URL link to your picture. Your picture is stored off the forum and appears via linking. You could also insert pictures, of course, if you had your own website or your picture was already hosted, but TinyPic works for those photos not already existing elsewhere on the web.
The following are instructions for using TinyPic to post your pictures on this forum: