Wrap the text you want in square brackets [text]
Example: Hello [World]
Output: Hello World

Wrap the text you want in curly brackets {text}
Example: Hello {World}
Output: Hello World

Wrap the text you want in underscores _text_
Example: Hello _World_
Output: Hello World

Hit the spacebar twice when you want a new line
Example: Hello  World
Output: Hello
World

Any URL that you enter into the box will be automatically converted to a link, no html tags required.

If you want to reply to someone, click there name to reply. Otherwise you can manually enter a reply.
Example: [@Username] - Hello!
Output: @Username - Hello!