You mean like in this post? http://www.freestepdodge.com/threads/who-thinks-the-male-characters-should-get-more-costumes.2384/#post-77103
Free Step Dodge
Forlorn Penguin
Forlorn Penguin
If so, you have to save the desired image to your PC. When typing your post, there's an option at the bottom called "Upload a File". Click that and choose the image you saved.