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