Probably you saw all the emoticons posted by people in channels like #ShareZone or other deviantart's channels.
In order to use that emoticons and get more benefits with additional deviantart's chat & website extensions you need install some stuff depending of your browser.
SuperDamn Chat Extension
SuperDamn is an awesome DAMN (DeviantArt Message Network) extension that will allow you to:
- use custom emoticons
- set away / back status
- ignore / unignore users
- and much more...
If your browser is MOZILLA FIREFOX follow this Guide:
1) step install GreaseMonkey extension for firefox at this link: https://addons.mozilla.org/en-US/firefox/