It is easy. You type a colon and then the letters for the emoji and then another colon for most of them. For example, a hug is the word hug with a colon on either side. No spaces. Also, when you reply, there is a list of 'Smiles' on the right. Click on one and it adds the code for your chosen emoji to your text. You can click on the 'more' link and then it will show you the codes for each option. If you click on one it will add it for you. Enjoy!