In the rich text editor:
@HexHaunt
In a comment:
[HexHaunt](https://chowlings.com/user/HexHaunt)
For Names and Avatars:
In the rich text editor:
%HexHaunt
In a comment:
[](https://chowlings.com/user/HexHaunt) [HexHaunt](https://chowlings.com/user/HexHaunt)