When you are replying to, or creating a new post, but can not see the smilies or other advanced text formatting tools follow this short, simplified, tutorial:
Go to your User CP:
Then from the vertical menu on the left you need to select "Edit Options":
When that page opens you need to scroll down the page until you see:
Make sure the drop-down menu is displaying what you see in the piccy, then scroll right to the bottom of the page and click "Save Changes"
Hopefully all will work correctly for you.
Go to your User CP:

Then from the vertical menu on the left you need to select "Edit Options":

When that page opens you need to scroll down the page until you see:

Make sure the drop-down menu is displaying what you see in the piccy, then scroll right to the bottom of the page and click "Save Changes"
Hopefully all will work correctly for you.