Emotes are a lot of fun, and easy to use! And a well-used barf face can say more than words ever could...
To use an emote, click on the smiley face icon on the left side of your tool bar
Select the emote you would like to use
You can also display emotes using keyboard shortcuts.
There are also a few hidden emotes. Try pressing the 'E' key and one other letter to find them!