1. Click on your message so that the cursor is positioned where you want the Smilie to appear.
2. Click on the Smilie that you want in your message.

Please Note :
You will not see the Smilie image appear in your message, what you will see is the text that represents that particular Smilie.
e.g. The text for the normal Smilie is :)
The Smilie image will appear in the message when its delivered.
You can see what it will look like by clicking on the "Preview" button below the message box.