I guess we didn't do a how to on that yet, if you click the reply under someones post the quick reply box opens, at the bottom right there is a go advanced button. If you click on that there is a fancy editor and there is a list of smilies on the right and a more link under them, you can click on one and it will insert it. The other way to do it is once you learn their shortcuts you can just type them.
If you type
it gives you :thumbs:
The other way is if you click on the big brown reply to thread button it takes you to the advanced editor.