I just checked your user settings. You have "Basic Editor - A simple text box" selected under "Miscellaneous Options". In order for your smilies to show you need to change this setting to "Standard Editor - Extra formatting controls".
To do this:
- Go to User CP
- Click on Edit Options
- Scroll to bottom of page
- Under Miscellaneous Options, select Standard Editor - Extra formatting controls from the drop down menu
- Click on Save Changes.