Alrighty. Go to photobucket, create an account if you dont have one. Upload the image of your smiley, and when it is done uploading VIEW IT AT IT'S FULL SIZE. You should then be able to right click on the image, click copy image, then simply paste it into a message. Rather than posting right away, in the more options menu of your post, click preview. It will show right away whether or not it is working. If that doesn't work, try getting the EXACT URL of your image, and pasting it in where the "picture" button is on your posting box. Best of luck!
-MB