You Can Add Emojis to Chat Messages
First click the "smiley face" on the left side of the chat box to select the emoji that expresses what you are feeling.
You can use Emojis to React to Someone's Comments
Click on the "smiley face" located on the right of their chat box and select the emoji to express your reaction.
Your emoji will be attached to the peer's message.
Deleting Messages
If you would like to delete a message you have already sent, go to the top right corner of your text and click on the 3-dot icon. Select the Delete option in the drop-down menu to permanently erase your message.