From a thread in the Tea Room -

Quote Originally Posted by andyrobyn View Post
... just love it Woodscooter - thanks ... if I could find how to use the smilies here, you would seee how much I am smiling now !!!! lol
When replying to a post, many people use the Quick Reply box that appears at the bottom of the page. This has no click-on smilies.

However, if you click on the button "Go Advanced" your part-written post will be transferred to the fully featured editor with smilies, preview and all bells and whistles.