Hi SuzyQ,
I see that your post has gone unanswered so I'll give it a try.
First, you have to upload your pictures to your website or a picture hosting website like webshots. Then the easiest thing to do is to select and copy the link and then paste the link between [img] (here) [/img] in your message.
Failing that, you could just PM the people who want your pictures and send them by email.
Good luck.