First you need to upload your pictures at a website that will host them. Many websites offer free photo hosting such as Photobucket, etc.
Also, ronusmc, a member in this forum offers free web hosting if you are interested. Here's the procedure:
1.) click this link:
http://rongeorge.com/modules/Gallery/albums.php
2.) log in ---- username : newfsm
password : models
3.) go to UPLOAD
4.) at the upper right corner click "admin options" then add pictures. Follow the instructions and your on your way.
5.) to post the pictures here use this string:
[ img]http://rongeorge.com/albums/upload/yourfilename.jpg[/img ]
(please omit the space between the "[" and "img]" and also between the "[/img" and "]".
If you are using another host site then just use the correct address to it in between the [ img] and [/img ] tags.