Pictures that you want to post can be stored on a web site, on a commercial storage service such as Photopoint, or in one of the free areas some servers like AOL give users.
Hope this helps!
Please don't tell people you cannot do that. When I started on HTML, somebody told me that I couldn't. I took it as a challenge and posted a pic from my hard drive. How about saying "you should never post pictures directly from your hard drive."