To use the icon in Deviation thumbshare forum, News articles & Notes:
1) go to the emoji you would like to use
2) press the drop down menu for sharing
3) copy the the thumbnail id. it should look something like :thumb[numbers]:
4) paste it into your message
5) TADA!! there you go~
ps. thumbnails wouldn't work in Journals and Artist Descriptions unless you're a premium member.
feel free to make it into plz accounts if you would like to use it in comments conveniently. (and share it back here so others can use it too?)
To use the icons in Comments:
1) click on "+Add Media"
2) looks for the emoticon in the community emoticon or search "Emoji-icon"
I am aware that not all emoji would appear and some emoji disappeared from that list after a while... i'm not really sure why either