decorating post message site-how?

so everyone has cute stuff to individualize their PM site.  How did you put little pictures and stuff under where you write?  I'd love to add my son and what I'm doing now...Thanks for the help!

 It looks like you got it figured out!  You can also insert more graphics in your siggie -- when you edit your siggie, click the third icon (looks like a little folder with a photo in it).

appreciate the tip!  Thanks...