Hi Ann.
This is something that you and other members might like to try with future messages...
When you click the green "New Thread" or "New Reply" buttons (rather than quick reply) you are taken to a new page to fill in the various boxes. Underneath the subject box there are a number of small icons, if you select one of these it will show against the thread in the list when it is published. There are quite a selection, a rainbow, smiley faces, a heart, a star and a few other bits too.
Happy experimenting....
Julia