go here
http://imageshack.us/index3.php
click the little browse button and find the pics on your computer.
it will give you an url
copy and paste that url in the body of a new reply(in the pet thread) and then put these [img][/img] around the url
example:
[img]
www.photobucket.com/vagina.jpg [/img]
without the spaces
or go to the link that audrey there gave you for photobucket and register
you'll be able to put your photos in a album and then post them here