Iff you click on the circle next to one of those smilies, it will take the blue off, and put that smilie at the top in the TITLE line. I did it with the first snilie, the green arrow.

But those are for icons for the title only. For the whole post.

You did that with the yellow smilie face. Thats how that works.

Now there are MORE smilies in a box to the right of the text box. Just hit one with your finger and it will appear in the text box.