Text smileys are created by typing two or more punctuation marks. Type the smileys without the spaces between the : and the other punctuation marks or it will not work. (I had to put the spaces in to show you what to type or it would just show the smiley faces and you would not know what to type.)
Some examples are:
What Text Do I Type to Make Smileys?
Smiley images and the text used to produce them*:
* In some instances, multiple text options are available to display the same smiley.